The reason I'm right is because I've been where you are. I'm not much older -- I'm 22 now -- but those few years make a world of a difference. So, I really truly do know how you feel. You may not agree with it at face-value, but you will find love again. You will find love so much greater than what you have right now, and a couple years from now you will look back on this and realize how foolishly and blindly in love you were. It's okay for you not to believe that, but I assure you it will happen. Love really is like an addiction. It's incredibly hard to just let it go, even when you know what you have isn't what's best for you. If and when you break up, you will feel downright terrible. You may not feel like yourself again for some time, but it will be the right decision.

Go ahead and talk to your girlfriend. Really tell her what the issues are and what needs to be addressed to make them better. Don't be rude or accusatory, but be firm. I honestly don't think much will improve from this, but I do understand your situation. If nothing improves, do not let it drag on for months. You need to reevaluate the situation and make a decision. If you decide it's not working out anymore, which unfortunately will almost certainly be the case, you need to move on. It's gut-wrenching, but when the time comes you should call her up and let her know, give her a few minutes to respond, and when you both have said what you need to say you need to hang up. And not call back. There will be tears and your heart will be beating out of your chest and you will fill physically ill, but that's the best thing to do.

I do wish you the best of luck. LDRs are not fun, especially for a first relationship, and even more so when insecurities take over. You will love again, whether you want to believe those words or not. In four years you'll come back here and pass your advice on to the next high schooler in a crumbling LDR. And you will realize how much better love can really get. Take it easy.