Not at all man. Don't break up with her just because you have an urge to fuck other girls. You're gonna have to bring this up to her. And communicate. "I don't want to resent you but I have an urge to talk to other girls. These girls will stay random meaningless hoes. You will remain my girlfriend". Obviously you gotta talk much more about this but yeah. Don't break up a good relationship just because you couldn't communicate your needs properly (or afraid to)

Honestly bro I love fucking as many girls as possible too but I was in 2 relationships (1 year and 2,5 years) and I have never seriously thought about fucking another girl so if ur already thinking about this so much after only 6 months then maybe you arent as in love with her as u think
Try some new stuff with your GF in the bedroom and then maybe the urge for sex with other girls wont be as big. If that doesnt work do what Black Attack said. Good luck and props for saying cheating is not an option!

Sounds like you've reached an impasse. My advice:

• Talk to your girlfriend about a potential open relationship. It'll be a tough conversation, but if you continue to ignore this urge, trust me it will ruin what you have with your girlfriend. Before the talk, I would come up with a better argument than "I want to be fucking as many girls as I can while I'm young." She won't want to hear that. Instead, explain to her some of the benefits of an open relationship, and try to make her see it as a good thing (Talk about some of the benefits listed here: https://www.verywellmind.com/what-is-an-open-relationship-4177930#toc-benefits-of-open-relationships). Explain to her that you can take baby steps and come up with boundaries for what's allowed and not allowed. Remember, you're asking her for permission to fuck other girls, which is a huge request, so be willing to negotiate with her.

• Be prepared for your relationship to possibly end. Whether it's because she denies the open relationship or because your urge becomes too strong and you break up with her, be prepared. But remember it's not the end of the world. You said that you're still young. There are plenty of girls out there, some even better than her.

• Don't sit on this for too long. Once you decide what you want to do, do it. The longer you wait, the worse it'll be.

I have been in this exact same situation before and it ended poorly. I don't want the same thing to happen to you . Best of luck man!