What do you do with your feelings?

I really have this terrible habit of masking when I'm feeling bad or forcing myself to feel different... It seems like I constantly have to remind myself that I'm a human being and that it's okay to feel bad sometimes. No one is in a good mood every second of every day.. I feel even worse when I share my true feelings with someone and realize that that person doesn't understand me... I hide such feelings and it doesn't show on me.. [i]Most of the time I'm happy and an incorrigible optimist and I spread that further, I don't just keep it for myself![/i]