Are you Serious ?

I always thinking why i am so stress ?Is that i am thinking too negative ?or too seriously ? I think i should make my self more happy, laugh, joke and many others
Just don't think too seriously, open mind and keep going or running. I think there are nothing to worry about except we need die, is its ? I'm always serious, but I should ask myself "For what I need to serious ?" I think the answer is "For myself".