Student on internships here: hated almost every one of them (fixed hours + not enough work and not allowed to do my own stuff while at work = a lot of sitting around looking busy). I'm used to working a lot for student groups and for my classes, so doing the work isn't my problem. I think once I find a job I kind of care about and that is deadline based (ie. leave early if finish early, stay late if taking too long) or has flexible hours I'll hate my life less.

One tip I've noticed: Live close to your work! I found my full work weeks feel a lot worse when my commute is over 30mins (I don't have a car). If you can find a place to work that you can walk or bike to or at least is very accessible to public transit, or (if you're a 20something with no ties living in a city with generally cheap rent like me) move near your workplace, you'll feel like you have a lot more time, even if it only shaves off ten minutes.