I can't get happy no matter what i do. even when i'm hanging with my friends or playing with my dog. do you think i have depression?

Maybe: Loss of interest in previously enjoyed activities and appetittes, finding no joy in things, pessimism, feeling "stuck in mud, " not motivated, feelings of helplessness and many more can be symptoms of depression. Please seek medical help, since most cases of depression are easily treated. See http://www.Nimh.Nih.Gov/health/publications/depression/what-are-the-signs-and-symptoms-of-depression.Shtml.