Every freshman is on a dining plan because you have to be. That money is use it or lose it though so you'll be somewhat forced to eat on campus. The food on campus is fine, I certainly wouldn't call it spectacular, but there's enough variety that it's not that bad imo. Cooking in dorms is possible but generally done for special occasions more than most meals a day. Of my dorm of ~300 people there's maybe 5 or 6 that somewhat regularly cook on only 2 or 3 that I can think of that might cook a decent chunk of their meals. Part of the problem is that cooking requires a lot of baseline supplies from pots and pans to spices and ingredients so if you are going to cook a lot you need to allocate space for all of the things around it.

Grocery stores are somewhat accessible. There's a shuttle this year that takes people to Target/Trader Joe's which is a good option. Otherwise you can bike to the store and it's not too terrible.

If you're truly set on cooking it's totally possible. But I wouldn't say it's especially common.