Guy Problems

okay so i’m 17 and i mean i’ve only dated one guy and it was a few years ago. i’ve never even been kissed. i’ve talked to a few guys here and there but it never gets anywhere. right now i’m talking to this one guy and i really like him, but he wants to send pictures with each other and i’m just not comfortable with that. i just have no clue what to do with him or any other guys really. help!