I know how you feel, smoking isnt the same for me anymore either, I prefer smoking alone now as I get para when other people are about when Im smoking.
It makes me lazy, if I need to get anything done, I always do it BEFORE I smoke because I know after Ive sparked that joint, nothing will get done!
When smoking pot got boring for me, I started experimenting with other drugs to try and achieve that 'high feeling' again. It worked
At the end of the day -whatever drug you use will eventually get boring if you abuse it too much. The key is moderation!