How do I stop fantasizing about a girl that I don't even talk to?

So once again I've seen a new girl and now I can't stop thinking about her and I know it's stupid and I'm absolutely putting her on a pedestal when I shouldn't. But I started college in the last few weeks and I take a bus from my apartment to the school and she lives in the same apartment complex so we share the bus and come and go at similar times. I catch her looking at me sometimes while on the bus and when walking to and from it.(and before anyone says just talk to her, no I'm a wimp it's not gonna happen)

How do I stop doing this stupid thing which is just torturing me. She's legitimately Victoria Secret model attractive so I always think her looking at me is just her looking at something near me because I don't think someone that beautiful would be interested in me (I don't think I'm ugly and I think I'm fairly attractive but I feel she's way out of my league). How do I stop stupidly fantasizing people I don't even know well (in this case I don't know her at all).
How do I stop fantasizing about a girl that I don't even talk to?
Post Opinion