I think it helps to find out what makes you feel good in life and go after it. Learn what your limitations are (if you don't already know) and what you are capable of, and then go after it. Whether it's researching things you're interested in, reading books, going to school, socializing with people who have the same interests and values, and who are positive AND understanding/compassionate, there are lots of ways to build positivity in your life. These are the things I have done for me, and I've found they work for me. I've also found, though, that no matter how much awesomeness I put into my life, life is still life and it still sucks sometimes.