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There is absolutely nothing wrong with you for liking both guys and girls. I know that your family and church say otherwise, but liking both guys and girls doesn't make you a bad person in the least. It's just who you are. You can't control who you are and who you develop feelings for, and it's not something that is easily "fixed." It's a part of who you are.

The important thing is to surround yourself with other people who ARE supportive. Your family may not be supportive, but do you have friends, teachers, or other trusted adults who you can reach out to about this? There are people that will love you and care about you regardless of who you love, and those are the people you want to surround yourself with. Does your school have a gay-straight alliance or something similar? If you're able to join it without your family finding out it may be a way to meet other people like you who you can develop friendships with.

It's also important that you are safe while you are still living at home. For example, if you do end up dating girls while you live at home I wouldn't bring them around your family if they are unsafe to be around. You want to make sure that before you live as your authentic self that you would be safe to do so, such as having a safe place to go if things don't go as planned.

While you are going through this, try and develop outlets for your emotions, especially when things get tough. Writing, art, or music are great ways to express your emotions. You can also do something like go for a walk or do another form of exercise. Also remember to practice self-care. Things are hard right now, but make sure you perform basic activities, even if it's just showering or brushing your teeth. But also do nice things for yourself, like treating yourself to your favorite snack, using your favorite lotion, or lighting a nice candle.

Treat yourself kindly. You are a good person with a lot to offer the world. Who you love does not define your worth.