How can I become more optimistic?

All the people in my major seem to breeze through homework, tests, and absorb every lecture like they've heard it a million times. This leads me to believe that I might have chosen the wrong major, even though it is what I really want to do. I'm already a senior, so changing majors now is out of the question for me, since I've already made all the arrangements for graduation. I know I will graduate with a very low GPA... not even high enough to get into graduate school in my major. The coursework that I'm headed towards in my last two semesters seems like total rocket science to me and asking for help, even from close friends in my major, is very embarrassing. I normally wouldn't mind asking my friends for help, but they have very belittling things to say about other people who don't understand the concepts. Plus, everyone that tutors for my major is also in my classes, so asking for help there is also impossible. I feel that if I don't get help and start understanding things essential to my major, I will completely abandon the idea of going to graduate school, or even trying to get a job related to my major. I don't want four years of schooling to go to waste... what should I do?

It seems like me and several friends have been going through a bit of disappointment/boredom with life after graduation. I work long hours and am too tired to socialize like I did when I was in school. I was just wondering if there's such a phenomenon of post-college depression?

Are there any techniques for controlling crying? I doubt that my problem requires clinical attention; however, it frequently manifests itself as a serious handicap. During conflicts (particularly with professional superiors or with significant others), I find myself unable to defend my position, which only makes the problem worse. Sympathy only tends to aggravate the crying and it is impossible to stop once it starts. I am a twenty-four-year-old graduate student, and I don't seem to be growing out of it. Any suggestions would be greatly appreciated.

I'm desperate (a permanent state, I suppose, not only for me, but also for most of my fellow human beings). I've forgotten the reason why I'm on this Planet. My life seems so senseless, eating, sleeping, going to work, hobbies, of course, while all around me, the world is tumbling down. How do I put some meaning in my life?

My best friend and I got into a fight. It's been a month and he won't speak to me. He says that he needs time, but that's the one thing I can't give him. I feel so hopeless and I've gone back to cutting after being clean for 11 months. I'm just so sad all the time and it just hurts — so much more than I know how to describe. And I know I shouldn't allow my happiness to be dependent on another person, but it is because he was the only one that actually cared. And I just don't know what to do. I can't bring myself to go to see psychological services and I tried calling hotlines, but I just can't go through with it. I'm trying to move on, but I just want the pain to stop. I miss him so much. And I apologized profusely, but he doesn't care. He doesn't care and I can't handle it. I'm just so upset and I just need help. I don't know what to do.

I am a 22-year-old male grad student, now starting my second semester at in graduate school. I have been doing very well academically, but my studies and my work-study job leave me absolutely no time for a social life! I have not been on a date since I got here; though I meet a lot of interesting people, and am in the habit of collecting their phone numbers. However, I can never seem to find any time to spend with them. Sometimes this really depresses me. I have noticed that I have lately been smoking much more heavily than I used to.