There is this girl I used to see around the campus and that I would catch looking at me.

I saw her walking alone and didn't think and straight up walked over and tried to start a conversation by guessing what she studied and so on.

Well after like 30 seconds she was like what do you want I said I just wanted to say hi then she said "hi" and walked away.

Well, the analysis I made of the situation is: -Next time I'll think about taking off my mask before approaching - I'll stick to contextual approaches and only approach spontaneously like that once in a while. - And I'll never ever again say I just wanted to say Hi but I'll try to think about an interesting thing about her to ask or find a joke but never again something that consensual