Looking For Suggestions?

I know this is a stupid question to ask . But I can’t hold it anymore…..My personality changes often. It doesn’t remain constant all the time. Well its not depression but something else.
Whenever I see any movie or hear any song or read any book…my mood changes according to those what i do…..If i am happy …the way i do things, it makes me change acc to it ….even sad sometimes…my opinion of life also changes .
I need some suggestions and some adages which I should follow….my age is going to be 17 soon….
Help me with good advise and some proverbs which i should always keep in my mind