What am I?

I’m great fun and sometimes crazy,
Loud or soft with moods quite hazy,
Full of love, sorrow, unrequited loss,
One minute happy another sullen, cross.
I see the world in shades of neon gray,
Rarely do I care or anyone obey,
My vibes are epic, they constantly perplex,
Full of contradictions, invariably complex.
I can praise the Lord, drink myself into a stupor,
Stalking the room with unrequited humor.
Sex is my go-to, gentle or pulsating,
Not always happy, at times tearfully heartbreaking.
I know the secret to capture every heart,
Life would be intolerable by keeping me apart.
Whatever you may think this is no passing phase,
I'm known to be pervasive and hound your mind for days.
My moods are epic, a journey to discover,
Your friend to soothe you or belatedly recover.

Come on - What am I?