Your biggest problem right now is you don’t know where you want to go.  Until you can figure that out you’re better off dragging yourself through school so you

Your biggest problem right now is you don’t know where you want to go.  Until you can figure that out you’re better off dragging yourself through school so you have some kind of credential to live off of.  You can always chase your passion once you find it.    Also, for what it’s worth, you might want to look into counseling for depression.  From the description of your life it seems like you’re a likely candidate (unhappy except when you workout and have endorphins racing through your body).  Depression can make you lose interest in even stuff are interested in so before you decide your previously chosen major is not interesting you should make sure it isn’t depression talking.