Guys please help need reassurance much appreaciated?

Basically I've been feeling sexually confused in a way all I want is my life back the way it was before 3 months ago... I'm attracted to girls more than ever... But I keep getting these homo intrusive thoughts and idk why it all started when my final set of gcse's were just starting literally. How has all this happened why? I mean I'm slightly scared of sex with a girl making it hard to imagine sex with a girl if that makes sense all I want is reassurance is this normal is it hormones? I just want my life back the way it was I was very very happy 3 months ago and not now. Could these thoughts just be curiosity? I have and only ever watch heterosexual porn. And will keep it that way but please give me reassurance this is normal and assure me I'll get back to life 3 months ago. Only positive answers please regards x