Please real answer how can I stop turning guys gay or Bi?

A lot of guys in their teens and early twenties are curious about gay and gay relationships, and having someone who's openly around them can make them want to chance their arm and experiment a bit with both the emotional and physical side of it. There's no way to stop guys reacting like this, all you can do is tell them no firmly when they do come on to you and recognise that in the vast majority of cases after a few months of pining most of them will be happy to resume friendship on a platonic level with you.