Thank for the responses, I do appreciate it lots as it is starting to help ease things a just to speak openly about this and have some input. All the advice regarding not rushing is definitely comforting! Honestly, I'm a bit scared to see what HRT actually involves.. I know that sounds daft, but I'm worried I may find out something which means it won't live up to my expectations.
There's only two people I've spoken to properly about this, one is a friend on Faceybook who I've known for a bit, she's being incredibly supportive despite my selfish incoherent rants about myself.. I did also tell my mum about some of these things too, she's been supportive listening to me and trying to understand but I can tell she's really apprehensive about encouraging me to go through any kind of medical treatment for it, but definitely wants me to speak to counsellors/psychiatrists etc.

Thoughts for today...
So sometimes I'm thinking, maybe this isn't a case of gender dysphoria, and just body dysphoria.. like those people who get really obsessed with cosmetic surgery, etc.. and do everything they can to attain what they see as their perfect image. I'm not ruling that out as a possibility anyway.. Either way the end goal is I want a female body and to present myself as female. Who knows! Hopefully these questions shall get answered by someone if I ever start getting into counselling/psycyhiatrist.
I've also thought a bit about why now.. why only now am I starting to think about doing something about all this. I've always had these kind of thoughts, but buried them deep. For the past 3 + years it was because I was in a relationship with a woman who I tried to speak to about this subject but very quickly put a stop to that. It led to me cross dressing behind her back which was one of the reasons she stopped wanting to be with me. I thought she'd have been more accepting as she has history with lots of her previous ex's being into cross dressing, etc. I guess she just wasn't attracted to that. Before that I was too busy trying to get a job and my career going.. it's only really when I've not been in relationships that I've been able to explore this side to me more.
I've been feminising myself a lot over the past few months, it's so much easier now that I'm losing weight. I feel much more comfortable now that I'm not just slouching around and lugging myself about.. walking with a proper posture, sitting with my knees together, silly little things like that I know, but I feel much more comfortable out in public like that. I dress fairly androgynous anyway, kind of tomboy-ish, but I'm absolutely nowhere near comfortable to start wearing skirts/leggings/low cut tops out in public yet yet.. that will come weight weight loss (and hopefully HRT, I think.. possibly).
When I'm out in public or with friends I wear makeup anyway, even in "boy mode".. or just andro mode. It's easy as everyone I hang out with are into alternative-type-stuff.. I'd hate to use the word goth, but er, I guess that sums up a lot of people I know!

To be fair, everyone I know personally are incredibly laid back and accepting of everyone, even my work colleagues!
I'm hoping being on HRT would smooth and soften my skin, it's very noticably harsh and male looking!
Odd thing about my weight loss. I still have tits. I've always had a large chest. I used to just think they were man boobs, they don't look like womens breasts anyway. But whislt I'm losing weight everywhere else - nothing is going from my chest.. so tonight I was able to my corset on and have proper looking breasts. That made me so happy to see. Probably doesn't look appealing to anyone else but I see that as a first step to actually growing real breasts and them filling out properly. ;\ I have to wear a really tight slimming vest when I wear shirts or tight fitting clothes as my chest looks massive. Frustrating.. I'd rather just not have to do that. But on this plus side, if I can have large breasts without estrogen.. I'm really looking forward to what I can develop with it.
I'm okay with people call me "he" and "mate" etc. Probably because I've not actively tried to pass as a woman to anyone.. However I do like it when people think I'm female (except that second glance when they realise I'm not!). Always used to happen when I was in my teens at college. To be fair I did wear make up and had long hair, so..

I'm starting to be a bit asexual lately. I've never been interested in men that way or desired sex with them, I've always only ever had sex with women and desired sex with them. But when I'm feeling like this and I look at a woman - instead of thinking "they're hot, I want to have sex with them".. I think "they're hot, I want to have a body like theirs". Bit awkward!
I've *always* hated my voice, I can't stand to listen to it back. I'd love to have softer tones to it.
Essentially I see myself as having two options.. start taking female hormones and let my body develop into female (I kinda think it's half way there anyway..).. or fix up my testosterone, have testicular implants & chest surgery to reduce my chest size (as weight loss doesn't seem to be doing anything in that area!). Even with fixing myself up as male, I don't see myself being too comfortable or happy.. I'm still shorter than every other bloke I know, still want to act feminine and what not.. Blerf.
There may be like a paragraph in here that is half written because I got distracted when I was writing this and don't really want to re-read it all to make sure it all makes sense. Whoops.

So uh, a more direct question rather than full on rambling incoherently like I seem to be doing.. I'm not entirely sure how to start or bring up the conversation with my doctor. Really not sure what to say!