First, take a deep, calming breath. You are not going to be alone forever. Fifteen is, in my opinion, the very start of when actual dates can start happening. Before fifteen, most "dates" that kids go on consist of hanging out on living room couches or potentially eating lunch at the same lunch table. At fifteen or sixteen, you could potentially start driving places, and you have enough money to get dinner or see a movie. And, importantly, at fifteen, parents actually start leaving you alone on dates.
So it's not like you've spent decades missing out on true love. You're going to be just fine. If you want to date, give yourself some opportunities to do so. You're likely going to meet any future boyfriends at school, but also consider joining some clubs and doing some extracurriculars. Increase the amount of time you spend around other people, make sure people know what your interests are, and you're going to find a boyfriend. At your age, potential boyfriends are everywhere.