You're interested, but don't have a crush? Frankly, this makes no sense to me. I don't understand what you feel. Plus, the fact, that you're old enough to be at university, but have never felt anything beyond, "Huh, she looks good" suggests to me that you might lean toward asexuality.

So let me define the parameters for you.

Do you want to kiss her? If yes, ask her out. If she says yes, all good. If she says no, it'll hurt, but that's how these things work.

If you're not sure you want to kiss her, then do nothing until you come to a decision.

If you don't want to kiss her, but just get to know her better, then just treat her like any other friend, except make her a first choice when planning, or at, social functions. And like nossy said, don't sweat it too much.