Jessica is absolutely right - you feel miserable right now and we've all been there (and still go there sometimes), but hold out as best you can until you can get some space between you and those who are stopping you doing what you want/need to do. Being dependent on an unsupportive family is not a good place to be, but there will come a time when you're no longer subject to their prejudices.
Which is all well and good, and I'm sure you've heard it a thousand times before. So, some practical things you can do right now that might help alleviate those feelings of being stuck:
- Are you 100% sure your family all feel the same way about trans people? Many of us here are surprised when we find out that people we expected to shun us actually accept us, and equally surprised when some of our best friends and closest family members disown us once they find out who we really are. Sometimes, it takes a bit of a leap of faith to figure who you can rely on for support, but give everyone a chance to prove you wrong. Let them show you that they don't support you, rather than assuming that they don't support you.
- Start planning for after you leave high school. What do you want to do? College? Straight into work? Whatever it is, try to figure out how you'll work your trans goals into those plans. Transitioning requires lots of forethought, and you can start that now.
- Is there a counselor at school who you can talk to? This is often a great and confidential place to start.
- You can do many small things to adjust your appearance. A shorter hair style that is more androgynous if you don't already have one. Clothing choices. Mannerisms and the way you present yourself. Observe guys in their native habitats and listen/emulate how they carry themselves and communicate.
- Don't shut yourself away, either in "real life" or here. I cannot overstate what a great community this site is, and how much dysphoria and stress and depression it has taken off my shoulders. Even if you come here to gripe on a regular basis, that'll help. Outside this site, are there any local trans groups you can attend? The one I go to often has teenagers at the meetings.
I'm sure others can chime in with suggestions that might help you feel like you're not standing still and getting nowhere. It's an awful situation to be in, but it's rarely permanent.
I hope some of this helps. And be careful, ok? Those suicidal thoughts - if you ever feel like you're going to act on them, it's time to let someone know.