HELP I'm really worried would i get in trouble for this?

Alrighty, no, you won't get in trouble with this, the police are busy with bigger an better things, but i could imagine the guilt(sorry I know, not helping). The best way to solve this is to contact this man on that website. If he found "you", you sWhould be able to find him. Explain to him that you are who you are and were just bored one day and being a childish teenager(if you are a teenager). Explain you are truly sorry and worried for the sake if that girl you impersonated that you may have ruined er social life. He should understand. Everybody does stupid things.