I just know she's the one I was waiting for all this time

This is ridiculous OP. You barely know yourself at this age and there's more than one person out there for you. You're going to change a lot until your mid 20s and chances that you and this girl stay together are tiny.

Being in an online relationship is one thing.... meeting them regularly, spending time together, eventually moving in together that's how you can find out if you like each other and are compatible. By just communicating online, you're missing quite a bit of the whole picture.

We talk for about 5-10 hours a day and have had some obstacles here and there, but overall I don't believe anyone else would be capable of what she is.

Because you don't know any better. Any girl who lives close to you could fill that role.