3 years in college and still have no idea what do i want. it's depressing. please help.

I really think you should leave the college and spend a year or so working. If you really want to stay, next semester try taking 5 classes in different subjects you are potentially interested in. At the end of the semester, pick the class you are most interested in and major in it. Make the decision and stick to it. Even if it ends up not being your favorite major at least you graduate in something instead of nothing. Also, stop failing classes.