You will definitely see a change in sexual experience once you start HRT. YMMV for everything obviously, but generally:
Getting and maintaining erections will be harder. Spontaneous erections & morning wood will go away within the first month. Some people don't seem to have a problem with it. For me, I'm less than 3 weeks HRT and erections are almost entirely gone for me.
Your erogenous zones and orgasms change. I heard vibrators are our best friends. After some time on HRT you might experience female orgasms instead of male orgasms. Hard to describe but it's just a full-body bliss (you'll know when you have your first one

)... they're a ton better than male orgasms for sure!
Anal sex? No idea. I never liked the idea and I doubt I'll try it any time soon. It's all prostate stimulation though so it might be less pleasurable since your prostate does shrink on HRT.
QuoteIs it normal for transsexual male to female people to start liking guys in an attempt to be more feminine?
There's straight trans-women, there's gay trans-women, there's bi trans-women. We come in all shapes. You're still young, you might find your sexuality is a lot more fluid than you thought. I've always been bi but since I started hormones, I'm definitely giving guys more attentions lately. Not saying they'll switch your orientation... but hormones do funny things to our brains.
QuoteI was also wondering... Does pre HRT fat move to female areas or will it stay there?
As for fat, fat cells don't actually migrate across your body. The body replaces something along the lines of 10% of our fat cells every year, so once you're on HRT, new cells will begin being deposited in female areas (face, breasts, hips, butt) while fat cells in male areas die off. It's all dependent on your metabolism and you can probably accelerate things with exercise.