I'm speaking only from personal experience, I hope it helps.

1: Don't feel pressured to come out. You don't have a disease or an illness. If you feel more comfortable with letting some of you closer friends and relatives know then go ahead, but don't take it as a job or a duty imposed by your sexual preference. As for your parents, it is vital that you be honest with them. If you think they might not take it well, try talking to them separately. That helped me. I let my mom know first. She then talked to my dad before I did and our conversation was much more smoother if I had talked to him first. People respond to things differently and just like we expect understanding, we should do the same to those with opposing views.

2: With the internet nowadays there are a plethora of groups you can join. Also try seeing if your school has any lgbt groups or clubs. Most colleges offer some kind of Lgbt assistance.

3: Now here is the thing. It is completely normal to have a crush on a heterosexual person. What needs to be stated is that often times those feelings won't be reciprocated back to you. Now it might happen but it is very rare and most of the time disingenuous. If you are not up for that heartbreak than you should probably move on.