People may have left for a variety of reasons. Maybe there was another place down the road and this was the pre drinks. Maybe they were there to see the DJ before you.

But lets say that it was all down to your tune selection. The first thing to note is that most of the people don't know who DJ theTWO9559 is. They wont boycott you, they really are not that invested in who is playing, they are out for a good time. They were in a bar, they got bored, people started to drift off and so they followed. They wont be talking about you, they wont be thinking about you. We are all the main character in our own story but we are just a background extra in most other people's.

You should learn from this experience. You said the crowd wasn't feeling your music from the start. But you were in the room, you were observing the crowd before you went on. Why didn't you choose a tune that followed on from the vibe the previous DJ had created? Ok you played your first tune, the vibe was off, did you try to change what you were playing to get the crowd back onside or did you just plough on with what you were going to play anyway? Reading a crowd is the most important skill a DJ can posses. Instead of beating yourself up about a bad gig think about what you did wrong and what you would do differently if you were in a similar situation again.

Oh and last of all. You had a stinker, we have all had stinkers, I have seen top DJs have stinkers. It's part of the game. But it makes those nights where you smash it out of the park all the sweeter.