I’m kinda talking to someone and want to get out of it… what do I do.

Okay so I 15 female have been talking to this guy for like 3 days. And I'm just not feeling it. He only talks to me in person and not on text. I haven't dated anyone since I was in seventh grade... and that guy broke my heart. So I just haven't dated since. Lately every time I like a guy and he shows interest it goes good at first but then after awhile I start feeling... like I get a bad feeling. And don't get me wrong this guy is really sweet and he's nice and quiet and smart and respectful. But I just don't know anything about him. And life already is hard and I really don't think I wanna get into a relationship right now. And I don't want to make excuses like that or anything but here's where I'm in a bind. I never showed interest in the kid or anything but then this guy I used to date suddenly started trying to set me up and now it feels kinda forced. And so I feel bad breaking it off and I just want advice on how to do it. Also back to the quiet thing, I'm also very quiet and I don't want someone who won't get me outa my shell. I want someone who brings the extrovert outa me. So please help..