Does anal sex make your hips and bottom larger?

I don't know if I'm your average 20 year old. (virgin and only had one b.f.)I have never been able to insert a tampon correctly, nor have I ever looked at my own va-jay-jay. I recently shaved it for the first time. I really don't know what the call is for anything relating to my womanly junk, you know? I don't know if I should leave the hair down there, wax, or completely shave it all off. I don't know how to insert a tampon, and I am worried when it comes to sex it just wont fit. I even tried with some dildos and can't fit it in, but I don't even know if I'm doing it right. Please, please help me! Those pictures on the tampon box just don't work for me!

Can you put in tampons even if you don't get your period yet, just for practice?