You're not a PoS as you described. This stuff happens when you're young and it feels like a much bigger issue because relationships are a new, exciting thing you're just learning about.

Talk to your dad. He's 100% going to understand and can probably give you some advice, or at least another person to talk to. The worst thing you can do is sit and stew about it. Drama problems feel 100% worse if you don't have someone to talk to. Even if they can't fix it/help, just talking about it aloud helps you deal with it.

Trust me, things are going to be okay.