Sometimes I think I should be selfish.

Yet being selfish doesn't benefit me.

Being selfish doesn't benefit you.

The more you share the more knowledge you get.

Share what you can.

Everyone should do the same.

Help yourselves too.

Try being independent. 

Think how to solve problems on your own before you ask anyone.

If you really can't find a solution then you ask.

When you get the solution on your own, let's say...

You should share it.

Really.

Try being independent and not be selfish.

You will feel a sense of achievement.

You will get something in return.

Don't stop sharing what you know.

Just know that being selfish doesn't benefit you.