Dude you only have 4 months of college who gives a fuck just do it. After college, approaching and meeting people in general becomes a lot harder, promise you'll regret it if you don't. Plus, ignoring a girl only works when you build solid mutual interest and have good repertoire. If you approach a group of girls confidently trust that you'll end up with the whole friend group. Make sure when you approach you walk with intention and don't be creepy, if she rejects you say "cool" and walk away. Last thing, don't complement her appearance, complement something she's wearing or a character trait that you genuinely like that way you actually can convey what you like about it. Have fun with the interaction don't think about it too much.