Your friends may be having a great time now but in the long term you will have the better future. It is just hard to see it at the moment. You must remember why you went to uni and ultimately that the social side really isnt that important. Try to get the love for your subject, get your head down and get on with it. It is natural to feel this way just after Christmas but just think, a few more weeks and summer will be here and you will be going into second year. Uni does go quickly believe it or not. I really think if you stick with it it will be in your benefit, although youre miserable at the moment. Take care.