Well... I don't have anyone to talk to. I'm married. But my wife doesn't understand it & doesn't know what she could do about it & just generally doesn't want anything to do with it. And I, for my part, am not a natural "sharer" either. It's hard for me even under ideal circumstances. So I just keep it all to myself. (I live a pretty thoroughly reclusive lifestyle at this point in my life as well.)
You asked if it's normal to not have people you can go to with personal questions. I guess I don't really know since I don't know anyone. My inclination would be to say that it's probably not unusual... especially for men. Is it acceptable to post on-line? Yes, I beiieve it is... at least here on PC. That's what we're all here for! I do presume one needs to be careful where one posts on-line though. I'm only here on PC. But I have the definite impression a lot of other websites are nowhere near as safe as PC.
I personally don't post my own threads here on PC... at least not with regard to anything personal. I'm too old & there's nothing to be done about any of it anyway. So it just seems pointless. Occasionally I have gotten the urge to post something personal. But the few times I have, afterward, I felt embarrassed & had to ask to have it deleted. I do share bits-&-pieces of myself in my replies to other members' posts when I think it is relevant.
The other thing you asked about was alternatives. The one alternative I can think of is to start a journaling practice. There are quite a few articles, in PsychCentral's archives, on this topic. Here are links to 2 of them in case the subject is of interest:
The Psychology of Journaling
You'll Be Shocked at How Therapeutic Journaling Can Heal You | NLP Discoveries