Maybe you could see this as an opportunity to meet some new friends? I know work is work but you have a lot of contact with people. If you could see your friends each and everyday you'd probably get sick of each other in no time anyway. At least you do get to see them on the weekend. Cheer up!!!!
You're doing a great job. Stay focused! You're friends probably have a lot of respect for your working so hard. You can't do much during the weekdays anyway. For working for a restaurant-you're lucky to have off on the weekends. Try to count your blessings?