Should I keep my truck or buy a different car?

I'm 17 and I just got my first truck. It's a 1995 Ford F150 4WD (5.0 V8). It's sitting in the garage right now because I can't afford to register, insure, and fix it (it needs quite a bit of work). I didn't buy it. My dad gave it to me. I absolutely love this truck but, I think it'll use too much gas. I had my grandfather's truck for a few days and I think it got pretty decent mileage (Ford Ranger) but, I did have a lot of things to do and places to go (so I had to put gas in it a couple times). I feel like if I were to get rid of the truck and get something else but, I feel like I'd regret it. What should I do? The 4WD is nice for the winter. I really love my truck but, I feel like it'll use too much gas. I've been thinking about selling the truck (and saving up more money) and getting something more fuel efficient. Maybe like an AWD sedan. I plan on going far away to college and I'll need something with better gas mileage. What should I do?

Added (1). I will NEVER make payments on any vehicle.

Added (2). I'm friends with one of the previous owners and he said if I want to sell, he might be interested.

You are correct, It will use too much gas. If you want a truck, sell that gas hog and get a smaller truck. But you will not be able to sell that old F150 for very much anyway. A few 100 bucks at most.
So just buy another truck /car that gets great MPG and keep the old f 150 if you want to.

If you do not have money to register, insure and fix the truck, how do you expect to pay for another vehicle and register and insure it?