I think I'm not going to drive my cousin to and from work anymore.
Why wouldn't you drive him anymore? It does sounds like your cousin is taking advantage of you.
I want to stop being his personal cab. And he doesn't seem to have any respect for me or my time
I'm sorry he's treating you that way.  However, you really should be available to do favors for your family members if they need you.  You might want to try talking to him about the problems you're having?
I don't want to deal with him. I'm through with him.
I guess it must be frustrating to always drive your cousin like it's required of you. You are right to stop him from taking advantage of you for free. I think to make amends you should still talk to him and sort things out, like asking him to pay for the gas or something to balance things out.