To try or not to try. (Relationship advice)

There's this girl that I like in my college. Ive recently started talking with her like about studies and all. She finds me funny. But the problem is another guy from my friend group is also hitting on her.Hes kinda well built and better looking than me.When I see them together I feel inferior and jealous. I feel like she'll never pick me over him. He flirts with her too.Ive seen her flirt back, but in an uncomfortable manner.Cause he smokes, and she doesn't like people whos smoke. So..Should I try on her still or should I let it go and focus on my studies?