Why do we grow up?

This is post is dedicated to my friend who was with me since last 4 years and now he left for his hometown leaving a big void in my life for atleast a month, because i know i'll get used to it in sometime. But as some-one has said "This is life" i have to understand that.
This thought keeps coming in my mind since i got a job "why am i becoming responsible? Why can't i be a kid again? Why do we have to part from our friends? Why life for grown up is so complicated? ..... and many more. The only friend when i'm lonely is my past the good one, the beautiful experiences which i had till the last one. I keep talking to myself and if you observe me i'll smile after i talk to myself. Many people might have observed me lonely talking something to self and smiling, getting shocked sometime, doing some hand gestures, might think that there goes a mad man.
Whenever i stop writting in my diary or blog, i call myself a horrible writter, but thanks to my manager in my company he appreciated my communication skills written and verbal. This is gives me a boost to keep on improving on this.
I have lot to write coz i think a lot. But the thing that comes to my mind is the thing that i feel i should write. Talking about my manager here in PSPL is very professional person, people crib about there manager but i like to focus on +ve points as that gives us to appreciate him/her and take inspiration from those +ve points.
Good Bye.:)