I am being charged for Larceny. Am i going to be going to jail?

I was just charged with Larceny in a building. I stole a wallet from a clmate and confessed on my own to doing so. I returned the wallet by postal service two days after i took it. I know have a warrant for my arrest and need to turn myself in. I have been convicted of retail theft once before, when i was barely 18..I am 20 now. I know i am extremely stupid, but only took the wallet because i thought it was funny, as stupid as that sounds! I have not been in any other trouble. Being that i took the wallet in a building, i am being charged for larceny in a building, which i know is a felony. Will i be going to jail?