I think I chose the wrong guy
What is telling you that you made the wrong choice?
My gut says he is.
It can be hard to know if someone is right for you sometimes, but it's important to trust how you feel. Moving on is the right call if the aren't the right fit.
I'm going to break things off with my guy before someone else tells me it's the wrong choice.
If that is how you really feel about them, then you need to do what is best. If you feel that the person is not the right person for you, you should trust your gut.