You can't really self-diagnose, but don't get hung up on the OCD label. It's so common these days to do that. It's not actually all that common an ailment. But anxiety is very common and anxiety always involves obsessive thinking or nobody would feel anxious. Or depressed. But nobody but you can answer if you're bisexual or gay, only experience will answer that. From your description of your life, it sounds like you're not, or you wouldn't have been so consumed with guys. Sometimes we get insecure about our sexuality, especially after break-ups, and especially when we're just starting out our sexual lives. Things go wrong, we get insecure, and start to wonder. It doesn't really matter what your sexuality is, but it does matter than you're thinking your way into being unhappy. You might want to discuss this with an adult or a therapist, but do know it's very common to have these kinds of thoughts. It's often said that women like to look at other women more than straight men like to look at other men. It's not necessarily sexual. But if it is, it is. That's not your problem. Your problem is you don't like how you're thinking, and for that you can benefit from discussing it. Peace.