How can i be happy?

I am 25 and still living at home with my parents. I don't feel like a real adult. I am living at home because I was getting my Master's degree. I just got my first real teaching job but with the economy, I think I might be laid off this summer. I cannot afford to move out. I feel very stifled and unhappy living here. Also, I don't speak to my siblings, which adds to my unhappiness. How can I accept this current situation and be more positive?