Burning and itchy vagina and my period is 2 months delayed. Possible yeast infection?

I'm really scared because I'm not sure what it is but my vaginas really itchy and when I per it burns so much that it makes me cry . I'm not sure if whatever is wrong with me is stopping my period because I've not had it for 2 months .I've tried putting sudocream on the area it burns but it's not working its so uncomfortable.I can't tell my mum because she will think it's from this boy I had round I didn't do sex with him but he fingered me and ever since then my vagina hurts.