Firstly go to your school conselor
This is all a part of growing up and has no reflection on your sucess in the future. To get you through the blues, you need to move to an active lifestyle - make sure you pack your schedule with activities and study times. Some activities available easily in colleges - an workout regimen, join a couple of active clubs, make going to the library a scheduled activitiy, join a voluntary group. While doing these activities you will meet many other folks and make friends.