Surely, true love really exist! But you will only find what you want if you choose the actions that leads you toward it. If you want to find real love, you must seek additional inputs to your notion of love, aside from the sappy romantic movies you see. You might want to read the bible about it, search Google about it, read answers in Quora about it.
Everybody wants to flirt with multiple girls or guys. It is innate that we want to have all in the world. But the truth is in our finite lives we can only choose a few. In romantic love, the Bible tells us to choose one because it will give love its most profound meaning. And it doesn't tell us to find or to wait! It tells us to choose.
How do we choose? We choose with every action of our daily lives. If I want to meet good people, I'll avoid going to overnight parties ever so often. If I want intelligent people, I'd study hard and be with those intellectuals too. If I want to marry a successful one, I have to be successful myself.
It's hard to prevent love stories from becoming our benchmarks and expectations when it comes to love, so it is also good to be careful so that we may not be blinded from the truth.
Sorry for being too serious there, but this is what I do as a pilosopo here on steemit. :D To sum it all, I suggest that you don't take relationships to seriously at your age, flirt all you want! xD But don't ever be the easy girl in school. You would be your best if you focus on building on your dreams. :)