NTA

First, I wouldn't call you an "extremely sexually active teenager", you're barely average. Maybe your opinion is skewed due to your upbringing.

Second, in a normal relation couples have arguments about all kinds of random things. They may be "angry" at each other, then have sex at night, and the next day they're smiling at each other again. Sex is the social lubricant, so to speak, of a loving relationship.
It is important that you find a man that satisfies you (or at least willing to learn, since I don't expect people with no experience to be magically good at sex from the beginning).

Now, you saying that you're going to cheat for being too lustful is complete bullshit. Humans aren't animals with uncontrollable sex drives. If some guy doesn't satisfy you, just tell him that and move on. A little heartbreak is way better than the betrayal and guilt.