If you're going to study in Sevilla, no matter how socially inept you might feel, YOU WILL HAVE ABSOLUTELY NO PROBLEMS MEETING LOCALS AND FRIENDS!!!!
There is a side of Sevilla which feels like a big University town. There are so many students everywhere. Once you get there, just listen in and ask around where the other students hang out. Invite others or yourself in, and join! You're bound to rub arms and make lots of friends. Just go to any tapas joint, you'll drink, eat and be merry! Don't worry, just be yourself, and be open!!!
Don't forget to catch some good flamenco music and dance while you're there, and Sevilla'n staple!!!