Am I just really tight?

I can't put anything up my vagina. I have tried tampons a countless number of times and they won't go in at all. I've tried to relax and everything (even for research) but it just hurts. I've tried to get my mom to take me to the gyno to see if this is an actual problem, but she won't. Has anyone else had this problem? By the way, I'm 17 :/