I'm mixed up In My head

You feel invincible.
You feel on top of the world.
You think "This is the life."
Suddenly, you're falling..

I'm getting used to smiling everyday.
I'm getting used to laughing everyday.
I'm getting used to being genuinely happy.

Being too happy makes me scared.
The higher I climb, the harder I'll fall.
I think I've lost perspective of my life.
I'm letting the days and nights get to me.
I need to wake up... before this dream turns into a nightmare.

I don't want to be this happy...
I know it sounds selfish.
But I really don't.
I know what awaits at the end of this tunnel.