Help please

so first of all, i have never had sex. 
but i'm afraid i may be pregnant. i've heard that you can possibly get pregnant from using a towel after a male, which i did. 
my nipples are in so much pain which never happens. when i'm on my period my whole boob hurts but i'm not on my period. and it's just my nipples. 
and certain foods like messy foods gross me out all of a sudden. 
and i have random bursts of anger. 
am i overthinking and being ridiculous or should i be worried??