I’ve got a few problems I’m wondering if some girls could help me x

so I really like this boy and we’ve spoken a couple of times and I don’t know if I should tell him how I feel about him or not, because I don’t know how he’ll react?

Also is it normal to feel horny at this age and I get horny quite a lot and just want to have sex even though I never have before

And finally what age is best to lost your virginity??