Think of it this way.
Remember when you were 16 or so. Remember your friends getting jobs. Most probably went to work at fast food restaurants, or grocery stores, or what not. Did you think, "Why are they working there? There's no future there! You can't build a good career at a grocery store!" Probably not. You knew what they were doing - they were looking for work, expecting to get some money, and probably some experience for later. As they got older, more and more of them turned away from "jobs" and looked more towards "careers".
So it is with relationships. When you're young, people tend not to think "forever". They're thinking, "This guy is fun - I want to be with him." They're not so interested in being with these guys forever and ever - they just want to enjoy him now, maybe have some fun, perhaps get some "experience" for later on. As they grow up, they'll be more inclined to look for "LTRs" rather than "my boyfriend this week".
Currently, you're just ahead of the game. That's fine, other than it's gonna be tough to find other guys your age who feel the same way. But there's a dirty little secret that the gargoyle's gonna share with you.
Soulmates aren't
found.
They're
built.
In the movies, in books, people see each other from across a crowded room, the music swells, they fall into each other's arms, we're informed they live happily ever after, fade to black, nothing more to see here. But life isn't like that. That isn't to say you can't fall in love quickly - you can. Or that you can't have a wonderfully happy life - you can. But falling in love doesn't solve all your problems. It just replaces them with new ones.
Consider. The handsome prince finds his...guy, let's say.

They dance, head up to the bedroom, all goofy smiles. Life is wonderful, right? Well, who's gonna be the top? Who gets to sleep by the window? What if prince likes sleeping with the window open, but other guy wants it shut? What if other guy snores? What if other guy gets up at dawn, but prince likes to sleep in?
...they never deal with this stuff in the storybooks. It's too unromantic.

But it's stuff you deal with every day when you get into a relationship.
As I said, these things are built. You find a compatible guy. You fall for him, he falls for you. And you start building. You might scuffle a bit, argue a bit, compromise a lot. And bit by bit, you build up your relationship. It may not be as romantic as the music-swelling variety, but it's solid. And that's why people who are in LTRs are so damn proud of them. Because they've put in work and sweat and tons of time into making the relationship solid.
My point (finally) is this. Don't walk around with your arm around an invisible person, with a sign "Insert LTR here." That's not gonna happen. Keep talking to people. Get to know them, date them, have sex with them if you want. Eventually, you'll click with one. And he'll click with you. And then - and only then - you can start building.
Lex