I'm dating a guy but I want girls so bad
Why do you want to be with a girl?
I know how it feels to have a vagina and people want the same thing even if they don't admit it to themselves.
While it's good you are discovering what you want, you shouldn't involve your boyfriend into it. If you truly want girls, break up with him to save the heartbreak if you cheat on him.
Nah. I'm going to keep dating this boy but I will cheat on him with the girls.  That way he won't get his heart broken.
Think of how your boyfriend will feel when he finds out about your betrayal. It is better to break up if you want a different relationship.