Why is it that every after happiness, a sad thing follows next?

I can't help myself but wonder why these things are happening.

I have been a good son, a reliable friend and a very trustworthy person.

But why is it that obstacles are always on my way? 

I even ask our Almighty... why me?

People may see me happy, laughter all over my face and as someone with full of spirit and inspiration every single day, but deep inside, my heart wants to burst out and just cry like a little boy.

Too many questions bother me.

I am disturbed but I still manage.

I am strong, but I am weak.