Hi Oliver, hope you're ok.
Until recently I worked with young people, and from time to time we would meet people who had been kicked out of their family home when their parents found out that they were gay. I'm so sorry if this might be happening to you.
It is something that people are aware of though, so if you could not go back home and you went to your local council and explained what had happened, they should be able to help you to find somewhere else to live, at least temporarily, if that's what you need. You might not be the first person they have met in a similar situation.
The national phone number for the Lesbian and Gay Switchboard is (0207) 837 7324, they provide information and advice for anyone LGBT who needs it and they could probably tell you about services in your area where people could help you talk to your parents, decide what to do, apply for housing, claim money to live on, sort out college, whatever you need really. They answer the phone 24 hours a day, so call any time.
In my experience parents do usually come round, but it can take some time so first priority is to make sure you are safe, have people to talk to and feel ok. Then who knows, your parents might just need a day or two to get their heads around it before they realise how wrong their reaction was at first and are ready to apologise to you. There isn't much you can do but give them time I don't think, it isn't you who needs to change!
Best of luck!