Missed period

I’m 14 and doesn’t have a boy friend and never sexually active. A few weeks before my period date I was peeing more than usual and then I missed my period for July. A few days later I started getting sore nipples but still no period. Now I’m getting a little bloated and gassy but still no period. Can someone help me? I’ve never peed more than usual before a period and I don’t know if it’s because I’ve been stressed and depressed about my crush this month. Plz help!