We are in an interesting industry which is forever changing, so enjoy. After you become big fish in one area, you will find that you are small fish in other 100 areas ;-) We all enjoy learning.

As far as helping others goes, you help as much as you can, but there is certainly no bound between people. On one hand, there is no need for you to feel guilty if you cannot help either because you don't have the answer, or because nobody listen to your correct answer. On the other hand, nobody is really required to take your advise, whether it is right or wrong.

You have to take it easy ;-) You say whatever seems right to you, and that's the best you can do.

As far as the ego part goes, we all have it, and we don't always listen. We try to control it, but at the end , we are all human. Again, take it easy ;-)