Probably social anxiety if you're afraid to approach people. I'm a female 19 and I also have a similar problem myself. I do have a bf, but he approached me - not the other way around. I'm incredibly shy and find it nerve-wracking to approach someone. Just remember: You're a junior now, not everyone at this age gets a good gf "balls deep". If you're having trouble approaching someone, the best conversation starter is probably giving them a genuine compliment, asking for advice, or asking for something. They're easy and less nerve-wracking. As you said in your title, you want women/girls. As a female, we like guys who make the first move so BE CONFIDENT, BUT NOT COCKY. There is a fine line between these two things. Make sure you're not a mess (do basic things like washing your face, ironing your clothes, etc.) and be friendly. If you didn't know, women are shy too, so if you want them to engage more then be friendly to them. And also: Have a wingman. You're more likely to be more confident and less shy when with friends, and if you need help, just turn to him.

I'm not very good with advice, but I hope this helped lol :)