I understand. Everyone has those thoughts like, "maybe they won't get me", "They're going to be far along and unrelateable to me now", "They're going to be way too girly and hard to relate to", "What if they think I'm weird?", "What if I'm just wrong about all this and I'm putting myself out there too much?" I'm sure everyone had an excuse, and I usually had a few. I was nervous as hell, but it was all worth it. I met people who opened up, shared their experiences, and found that not only did we all share so much in common because of this, but it also made me feel better that (selfishly) my problems were far from the worst. Being transsexual makes you feel like an outsider, even in the LGBT community. The first place you're likely to be accepted and naturally fit in will be a support group with other trans people. Imagine the feeling you got opening up on this forum times ten and that's what it was like going to a support group.
Of course, not everyone has had the best experiences with support groups. The truth is, while I respect every trans person for the courage to go through this, it doesn't mean some of us can't be a-holes or b-----s. Just because you transition doesn't mean you're a saint and know more about the world. Still, you're far more likely to get empathy from those who have gone through it than those who know nothing about it.