If you are being put in physical contact against your will, you need to report it to the school. That's not ok. I'm not sure why you care if other people are gay or bisexual, but that's besides the point if you are being touched without your permission. But I can't quite tell from your post if it's other people engaging in physical contact with each other you don't like? If you're not the one being touched here, while you may not understand or approve of it, that's their right to do so as long as consent is involved.
Or is it that you're the one being touched? If you are being touched when you don't want to be, firmly tell them you do not like it and it needs to stop. You don't need to give a reason. There's no need to bring in the person's sexuality. It doesn't matter why you don't want to be touched. If you say no, that should be the end of it, period. If it continues, you need to tell the teachers/principal immediately, as that is assault. Again, just tell them you are being physically contacted when you have stated you do not want to be so. You really don't have to give them any reason for it. Your body is yours and it should never be forced into physical contact against your will.
So I don't entirely understand the situation here, but definitely keep yourself safe without worrying about giving reasons for not liking it. The person's sexuality doesn't matter. Whether your dislike is due to your past or not is none of their business. You don't like it, and that's enough reason for them to stop immediately.
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