To determine if your boredom is normal you must determine the cause.

Is it because sailing no longer fullfills what you initially desired?

Have the waterways become so crowded and stressful that the cost outweighs
the benefit?

Are you coming down with some type of disease that is affecting your mental
state?

Have you read too many Capt RB posts?

If you are willing to give some more information, the cause may be worked
out.

Amen!