This exercise is a great one to reduce stress and lift the pressure from your shoulders. If you unload on people you may momentarily feel good, but it is very destructive and unhealthy. It will give people the feeling that you aren't safe to be around.
The best way to unload is to journal it. Don't be frightened by the word journal. Just get several pieces of paper and begin getting everything off your chest about everything and everyone that bothers you. Don't censor yourself. Let it all out. When you are done begin ripping the paper into pieces. With each rip tell yourself that you are leaving those issues and problems on the page. They will no longer follow you around. This will give you a stress relief for the short term. You'll need to address those issues head-on before you can make peace for good.
Try this exercise and see how you feels.