You should definately do it, I promise you it will be the best and most important thing you ever do in the long run, you won't ever look back. It took me a while to take those first, few tentative steps too, it seems an age ago now although it's not even been a yeaar yet since I first spoke to someone official.
Before I made the leap, I too was worried; about how people would react, what they would say etc...even if they would laugh or wouldn't take it seriously.
My doctor was super, really understanding, so was the pyschiatrist he referred me to for assesment and now today I got a letter through the post, I finally have my referall to the gender identity clinic in january where hopefully I will commence T after being assessed by them as well!!
It will seem an incredibly long process, I am only just at the beginning myself and I have been waiting for several months just to get my referral from the GIC and my appointment isn't until January 21st but I am so, so glad I took those first steps to get the ball rolling so to speak.
It just got to the point for me where I couldn't just sit back anymore, I had accepted and come to terms with myself and had been living as a man for awhile but I knew I needed to kick start the process of getting on to T and eventually getting surgery so I can feel more at home in my own body.
I need to do this and if it's half as important to you as it was/ is for me I urge you to bite the proverbial bullet and take the plunge. At least to talk through your feelings about this with a professional.
If you ever need anyone to chat to in more depth about this I am more than happy to lend a friendly sympathetic ear and whatever guidance, advice etc I can offer. I am not a trained counsellor by any means but I do understand completely how you feel.
Best of luck with it all (and I know you will find the strength to do whatever is right for you, no matter what that is)
