We live in a society where there is Facebook, Twitter and Instagram, among many others. This isn't a quality that comes easy with being young.
Posting pictures and statues every now and then is okay, but constantly bombarding your followers and friends with your relationship isn't going to make them happy, and can easily lead to an argument with your boyfriend/girlfriend or possibly a breakup. We want what we want for the reasons that we want it, and normally if we don't get it, we aren't going to be too happy.
If the only thing you care about is what you're going to be doing on Friday night, dating someone who is worried about their life past high school just isn't going to work.
Second, you have to have someone whose interests are the same as yours.
As a senior in a public high school, and as a person that has spent almost 12 years of my life in the public school system, I can confidently make that statement.