A hint I was given which helped me was to ask "is this a good time to talk", when I called someone, or "do you have 10 minutes to talk?". Then I would know that I had done my bit in making sure I was not bothering people or taking up their time. I would stick to my 10 minutes, but make sure I asked if it was OK to talk longer. They can then be responsible for their part....
I know that feeling. I would only talk to someone who I know will listen.
Just remember we are here to listen
I used to feel this way often. I didn't want to be a burden to my family and friends. As it turns out, they were the ones who encouraged me to talk about it with them. Each one has told me they want to help me, but they don't know how. This provides them with a way to help. They know that they can't fix it, but they also know that by NOT keeping it all inside, I do feel relief from our talks. Sometimes we don't even actually talk, but we text and e-mail. I isolate myself so much when I am really depressed that these ways of staying in contact are so important.