I'm now 14 months sober, I reached that point where instead of things being fun, I could see more negatives.

I had a big wake up call on a camping trip over summer last year, after taking too much MDMA any one person should ever take in one night, After laying down for a good while when others slept, I went to answer natures call, walked to a river bank, but I just stood there and blacked out, came around after hitting my head on a tree (luckily hitting that and not falling down the bank into the river)
passed out a good number of times trying to get back to the tent.
Two weeks later I took Acid and it was a night of bad craziness, everything had become ugly on it, I felt that my relationship with drugs had completely changed.
From that day I swore to stay sober and have not looked back since.

A month or so after I applied to be a bus driver, done my training and started that as a new job, to get my highs these days means running to the time table and hiking in the mountains on my days off.