I would say it's quite common to have a selection of people who you discuss different issues with, different friends/family bring different things to out lives so that is natural.

Mostly I would say I am the same in that I don't tell everybody everything.

I do tell my husband just about everything, he can be helpful sometimes, but other times although I confide in him in it's actually other people in my life who are better equipped to understand. I don't think it's realistic for one person to understand everything.

I have seen a therapist in the past, it was a positive experience for me, it's different to a good friend in that they are much more objective and applying techniques to your conversation. Also it's not 'two way' - in the way a friend would be telling you about their life too and you would be giving them input on their stuff. Tbh I found that aspect awkward - I don't like talking about myself all the time and that's pretty much what therapy is, so there were a lot of silences in our sessions. Lol. I still recommend it though, because unlike a friend you don't have to worry something you disclose may ruin the friendship.

Hope that's helpful to you.