Am I eating well enough?

I’ve just started college, and it turns out that the provided food is better than high-school swill, but only marginally so. The cafeteria food is covered in grease and soaked in fat, so as a result, I eat a lot less than I used to.

My daily diet is usually:

A bowl of whole-wheat cereal
A salami, swiss, lettuce, and onion sandwich on whole wheat bread.
Blueberries and Raspberries from the nearby co-op (though I’ve just run out).
A Peach Yogurt
A Bran muffin

This is occasionally supplemented by an apple, a banana, and other forms of meat, but that’s pretty much it.

Looking at it now, that really doesn’t seem like a lot (and I seem like a health freak). Is it enough in terms of quantity and quality? Am I getting enough vitamins, enough protein? If not, what should I add?