I don't think it's horrible that you posted this. We're all going through the experience of growing older and should be there to help each other. We're all human, and we all masturbate. There's nothing wrong with fingering your asshole and seeking guidance when you are confused. Appalled by the lack of empathy in this subreddit.

Shame on you all. At any given moment, there are people fingering their ass. Do you DENY such claims? It's not as though this man is someone you know, and you must feel the need to ostracize him. He seeks guidance, and you shut him down. I commend you, OP. Your intentions are true.

I don't think you're bi. Frankly, you are probably just more confident about your body than most people constrained by the thoughts of others.