How can I fix myself?

I feel extremely tired and cranky all the time. I’m so easily irritated by the smallest things and some times yell at people for no reason. I sleep 8 hours a night and still I feel so tired and stressed out. I feel like everyone is working against me and I’m angry all the time. What should I do? I don’t want to be a mad, pissy person all the time and get angry and friends and relatives for stupid reasons. I don’t want to take any meds though. I need help