Bite your tongue

You know what I have always found interesting?

Your friends will often tell you that you should feel free to talk to them about anything that's bothering you. You should be able to trust them with your deepest, darkest secrets, and you should be able to vent to them about the things that annoy and frustrate you, even if they're trivial things. However, my experience has been that sometimes those same friends don't want to hear about the things that annoy you if they don't pertain to them. Sometimes they'll let you vent but won't actually listen. Sometimes they decide that you're a negative person in general just because you're stressed and have no proper outlet for your frustrations. Sometimes they just really don't care about what you're talking about and don't want to hear about it, even if you really need to talk about it.

So then to deal with this problem, you learn to not talk to your friends about things that bother you if they have nothing to do with them. You keep it to yourself to keep your friends happy (and to hopefully get them to stop calling you negative or bitter just because you were overwhelmed and stressed for a given amount of time).

Then your friends get upset with you for not sharing with them, for not trusting them. They feel hurt that you feel you can't talk to them. Or maybe they're upset because they don't want to be seen as a bad friend... it's always hard to tell.

It's an impossible, interesting, frustrating cycle.