Hate to burst your bubble pal, but that's what EVERYONE who is experiencing young love thinks. They say to themselves, "yeah, I know that for most people 'young love' is the truth of the matter, and it won't last. But I just know it, I'm the exception." I've been there, my friends have been there, and chances are you are too.
Now don't get me wrong, it's not impossible for young love to work out, but there's something that's really hard to understand when you're at that age, something which becomes a lot easier to get once you're older, and it's this. You're not grown up yet. Who you are, all the way down to your core values and the very things that make you yourself... all of those things are subject to change. Not that they all will. But understand, most of us are radically different people even just one or two years out of high school, not to mention how much we change further down the road than that.
The problem then is this, how can you hope to love someone, when neither of you really understand who you, yourselves are, and neither of you understand the other either. Sure, as you get older, and start to come into yourself, it might be that lucky case where the people you'll grow up to be are compatible. Just keep in mind that statistically that's not how things end up working out the vast majority of the time.
So, in conclusion, I would say that there is no such thing as young love. Not because love when you're young can't work out, but because young people don't understand who they are yet (hell, there are a shit ton of older people who don't even understand who they are). And until you can understand and love yourself, it's very difficult to genuinely love someone else in a romantic sense.