I [M] want a gf but don't want long term commitment (2 years of college already finished)

So I've been single my whole life, had a few crushes throughout middle and high school but nothing more. My roommates have had gf in the past and one has one right now and seeing them hangout and enjoy each others company makes me feel so lonely. I want to date so badly but only short term because I'm literally in college. Need I say more? The problem is, I've always imagined dating to marry and don't know how anything else works. I'm also not really a US citizen so can't get a job and my parents financially support me. So I'm just lost. That's why the past 2 years of college I've jsut been focusing on my own work and myself, but it's getting old. Seeing so many couples hanging out together and studying together etc.

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 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.

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.

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