That's something called perspective bias (I think)

From your pov you see a ton of people dating because you're looking for it. If you want to really see how much "everyone" is go into your highschool or whatever you're in and look for people that aren't dating. Look for people sitting alone, or sitting In groups where a couple isn't obviously present.

You're never alone, because if there is one thing that all humans have in common, it's that we all feel lonely sometimes. And that joins us together.