If your school has health services they probably have mental health services too. Talk to a counselor. "at least I'm wanted" is an unhealthy thought process and will never lead to a relationship where you're treated well, because you will always put up with more than you should from your SO. It's similar to the thought process I've seen from people in abusive relationships.
I respect that you're trying to separate YOUR thoughts and opinions from what "everyone else says". That's commendable. But if literally EVERYONE you talk about this, friends as well as strangers, mono as well as poly folk are all telling you the same thing, hopefully you'll decide to listen.
Pan Female, Hinge in a V between my mono (straight) husband, Monochrome and my poly (pan) partner, ThatGuyInBlack