I [M20] like this girl [F21] but I don't know how to approach and if I should approach in general.

Now there is this girl I think is quite pretty and she's a friend of my roommate who he met in physics and chem class. She's White Hispanic and I feel like she might have a thing for me too but I don't know because I've literally never asked a girl out nor have I been asked out. Most of my childhood, I wasn't allowed to talk to girls. I'm worried if I ask her out, she'll want it to be long term or smthn. But at the same time, like what does short term even mean? Like do we have a deadline after which we don't hang out. Like this whole concept of short term is so confusing to me.

We've hung out like her, roommate and a few others together twice now and it's very chill but I worry it might be a friendly vibe. She hasn't even asked for my insta or anything.

One of the main reasons I don't want long term (along with the financial aspects) is that I want to marry a girl that's of my culture and this girl is not. So I am very lost.

I also don't want to go out with her and then cut things off just because I don't want to marry her but at the same time, I'm putting too much thought into marriage when I'm only 20. She has also had quite a rough childhood with a problematic dad and both parents splitting. I feel like she'd actually be better off with a guy that can support her in EVERY WAY possible (emotionally, pzychologically, financially etc.). But like I still feel like she actually likes me but at the same time I might be very delusional.

Also, my parents do not support dating 100% so it would have to be a secret and during the school year only unless I take summer classes.

Sorry for the rant. I'm just very lost.