Yes, I drive him back and forth from work. Yes, I pay for most of our outings. And yes, I get him nice things for holidays/birthdays. But I don't see how he's taking advantage of me.
I'm sure he would do all those things for me too if he could. He gives me money for gas when he can, and he tries to help me when he can. But he repays me in so many other ways other than money. I really love him.
It wouldn't matter what other people would think if those people weren't my parents, and my parent's weren't making comments to him every time they see him and constantly telling me how he's no good and how they are going to start to forbid me to see him.

I don't know how I can show them that he's not just mooching off of me. Theres no way to explain it.

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[insert something funny and original]

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would you say you're taking advantage of your parents because you let them buy you nice things?

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no. that is their wishes. and me taking care of my boyfriend how I do is my wish. so why would he be taking advantage of me?

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[insert something funny and original]

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Well if he's not, why would you have to explain that?

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because my parents are old fashioned and think the guy should provide for the girl. In my situation, it's just not like that. They don't understand though, and they think he's taking advantage of the things I want to do for him, because he can't do the same for me.

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[insert something funny and original]

If you have to live with them and they are stupid then you have to take some of the crap they deliver.  If you move out you don't.  I don't know how old you are but sounds like it's time to move on.  

The best thing you can do is not tell them anything.  The more information that have about him the more ammunition they have against him.  At some point you have to take a position and tell them that you are not going to quit seeing him and they better stop treating him and you the way they do.