Someone please help me!

Every time I'm feeling a little aroused or anything like that I get a really sharp pain in my stomach and lower area. I'm only 16 and I'm not pregnant and have been tested for a uti. I don't know what to do, it really hurts and has been happening for maybe 2-3 weeks now. Someone please give me some answers or what to do. I was thinking a pap but I've never gotten one and I'm scared to get one