Sorry I haven't replied to your post before this. I haven't checked this section of BB forums for a few weeks. I hope you're still visiting the forums. You sound like a nice guy and I think you could find a lot of support on here.
I think I experience anxiety similarly to you. I also live in a small country town, some days I feel confident to go down the street by myself and others I am terrified to even leave my room. It's hard because I never know what will trigger a severe anxiety reaction, or when it will happen. So yeah, I understand how hard it can be.
I'm sorry that your dad is not very supportive. It's the biggest source of mystery to me why some people care what another person's sexuality is. I've got very strong feelings about this, I'm of the opinion that attraction is attraction, love is love... I don't care what package it comes in, and I think it's a sad commentary on our society that people feel the need to define their sexuality at all. We're all just people, we all need love, friendship and support. Gay, straight, bi, trans, pansexual, whatever - we're all human and when you get down to it, we are all the same at the core, wanting love, contentment and acceptance... we just go about different ways of finding it :)
Sorry for the rant.
I think it's great that you had the courage to come out to your family, even if they didn't all react as you might have hoped. A lot of people go through life afraid to be themselves, so it's a brilliant (and probably the hardest) step that you've made. You should feel proud of yourself for that.
Are you close to your brother? Are you able to confide in him the thoughts and feelings you are having?
Do you have friends in town who understand your situation? Anyone who can be a shoulder to cry on, or even who can take you out now and then and distract you? Do you do anything with your singing? Maybe you could join a band with some friends or something?
You mentioned that you are going to do some online study. That's cool. I think that study can help give a person a feeling of accomplishment and encouragement. Like with my depression I often feel worthless, but when I do a short course for the volunteer organisation I'm a part of my mind says 'yeah, I'm not so stupid after all. I can learn new things and do them well.'
It's nice to meet you. I hope to see you around the forums :)