You question why it's hard for you to belong anywhere. Everything happens for a reason. When we reach puberty and start to realize the opposite sex exists, our life is all about a set of new firsts: You're not overlooked.
But the fact that you are welcomed to so many groups says so much about your personality. All your friends are busy hanging out with someone else or you check your social media and see that all your friends are in their respective groups hanging out and having fun.
With our rose-colored glasses on, we believe our first love is the "end all, be all. But how exactly do you know if it's right, or if you're holding on to something from the past that just isn't destined to pan out? However, I understand because there are days when you feel like there is no one to hang out with.
Your first love is called just that because it is part of a series of "firsts. But still, that fear of never finding someone who will ever make you feel that way again nags at your mind.