questioning and lost

I've always dated guys and in my family being gay is not acceptable it's okay that other people are but just not me. But I've always questioned my sexuality. When Ive dated a guy I immediately regret it and start feeling guilty because I want to be with a girl. But suddenly when the relationship ends and I'm free to date, I suddenly retract from the idea that I like girls. I panic and then deny it and then I question my sexuality even more. It's complicated, i know. I just don't know. What do I do? I need help. I'm