I know exactly how you feel man and although things may seem tough now you need to have positive thoughts for what's to come in the future, because honestly nobody knows what the future holds. Ever since second year university i've sulked in my guilt about having no idea about what I will be doing when real life hits me after school. Friends come and go. Those that you truly care about and those that care about you will be there with you for the rest of your life or as long as you choose. The same can be said with girlfriends. I hardly have any friends left from high school but some of the relationships that you will maintain for the rest of your life, come after people are removed from the adolescence high school. This time two years ago including last year, I felt like I was drowning. My parents provided the world for me from skiing to school, living and I never appreciated shit.  My list of sexual encounters was less than impressive and daily, I was freaking out about starting a real life after school. I almost wished the world would end in 2012 living in what i thought had been, the peak of my exciting life experiences. I had very little hope for the future it almost seemed life "Suicidal fantasies 'may' have been on my fucking mind."
 I'm now about to graduate with a degree i first thought was useless. Since those times of utter despair  I've discovered new opportunities, life long relationships and experiences that I will never forget for the rest of my life. What helped me has been constantly looking to those that I love and love me. This includes: friends and family that I will have for the rest of my life because they love me if not more than I love them. Instead of wishing it was over in 2012, I'm fortunate I am living 2012. what I'm saying is don't give in and appreciate what you have, because to those that surround you, you are irreplaceable. Instead of freaking out about the future you'll soon be in the position in which you have to decide your own future, an exciting yet very decisive time that I am currently going through.
hope this helps