>>1I'm a high schooler like you, I'm a senior now but I dated a girl in my sophomore year it was both of our first real relationship it lasted a while but it eventually ended horribly. Though to be honest I regret nothing. Think about it this way, however long you wait you'll still have have a first relationship. Why not do it in high school and get some practice before the real world.
P.S. I'm in another relationship this one has lasted just over 6 months, you never know until try.