Do What Makes You Happy
When your not happy in a situation just leave and don't look back. Don't dwell on the memories or what could of happened. If it's not working for you, just change so that if DOES work for you. I’m not saying give up at the first downfall just don’t keep making the same mistakes over and over again. Modify the scenario and change things till they work for you. Never settle for misery, Life can never be enjoyable being miserable because you are too afraid to open up your own opportunities to benefit you. Take the "L" and learn from the mistakes and make yourself happy, ALWAYS!
Any negativity is very toxic to your mental state including unhappiness. It can shift your morals and perhaps depress you severely. The tricky thing about obtaining happiness is no one can fulfill that hole but you. You are the only real person that can ensure your happiness. Yes, other means can make you happy. But its YOUR choice to be happy or to stay mad. So why put your body or your mind through all that hassle being miserable.
If something is just not working how you expect it, get it a different way. Figure a way you can get what you want or need out of the situation to stay happy. Trust your gut, follow your heart but never leave your brain behind. The mind is one of the most powerful tools you will ever have. Keep it healthy by maintaining a positive vibe full of happiness. More importantly use the tools you have.
I don't know what may be troubling you or what may be upsetting your soul/spirit. But change it in a way that it benefits you on all levels! Time is limited and anything is possible. Believe in yourself on all levels and keep making moves. Don’t stop, do what it takes makes you utterly happy.