I really needed to use the bathroom but I was scared to go inside of it.
Is there a reason you're scared to go into the bathroom?
There's a man in there that I'm afraid of.
I understand that you're afraid of someone that's in the bathroom, but you shouldn't wait to long. It can be unhealthy to not use the restroom and you shouldn't let other people bother you. The man is probably safe and won't hurt you.
He's probably not using the restroom.
If he is just using the restroom, he should be out soon and you can go ahead and go in. If not, he should probably be reported to somebody. Either way, is there another bathroom you can use in the meantime so you don't need to hold it too long?