Who Am I?

When I'm with my mum
I'm always moaning
Never happy with what I get
Always wanting more

When I'm with my friends
I'm a loyal friend
Always seen with a smile on my face
Filled lots to say

When I'm at school
Iâ??m a smart student
Aceing tests and always
Having a positive attitude

When I'm on my own
I'm a depressed little shit
Who cries through lonely tears
Confused, lost and hurt
I wonder out loud

Who am I?