Unable to love

I’m a junior in high school and I’ve never had a crush sure some people I’m like their cute but that’s it and I don’t think of it after I leave class or even in that class that long I say I’m bi because it’s either I be bi or a lesbian sometimes I feel like a liar like how do I know I’m bi if I never had a crush I guess I base it on since I day dream a lot on who I would date (though in most of my day dreams it’s a girl who I made up) but I really wanna date and hold hands and blah blah blah I can wait but if I’m like 43 and never experienced that like what if I don’t love the person I marry tsk oh well I’ll just endure.