OK you are going to school, smart move on your part, in your future your better earning potential will enable a better life in general.
From your lack of social contacts, I would guess you are not living in a dorm.
Living in a dorm enables more contact time with others around the same age as you, but during times they are not in class, especially Friday evening and on the week-end when those who live to far away are stuck on campus.
The down side to living in a dorm is the lack of family contact. If you have a decent family, lack of contact with them can have a much greater load on your mind then you realize.
To use a mixed metaphor "Life in the dorm is like a box of chocolates", most girls crave attention, and like to get attention from as many people they can. So there is more opportunity for them to take an interest in you so you can show them some attention. Just do not expect them to think of you as the only piece of chocolate in that box. They are like a kid in a candy store when it comes to getting attention, and they are looking to see what each one is like, and they probably will have received attention from others before you, may be getting attention from others besides you, and will find others to get attention from if you no longer have time to give attention to them.
Another good place to meet people is clubs that are organized around a hobby, and adult evening classes that your local community college have.