My friend needs a ride to the store and I don't want to drive them.
Why can't you just drive them?
He shouldn't ask so much from me; I have a lot of things to do.
You should help out your friend more. He needs help so you should drive him.
I don't see what the big deal is?
It's a simple ride to the store and if you can make time to help your friend out then it's the thing to do. On the way, let your friend know that they too should be more mindful of your time and schedule in the future.