I don’t know what’s going on or what to do

So I’m 17 and a couple weeks ago I’ve tried to have sex but the guy I was with couldn’t get it in. I’ve also never been able to put in a tampon and now I’m afraid that something is wrong with me or my “body”, I’ve never been to the gynecologist so that’s not any help. I’m scared if I try sex again the same thing will happen then I’ll be even more embarrassed.