It's called Cross-dominance and is something I have as well. Certain tasks feel more "right" to perform with one hand over the other.

It isn't strange to use your non-dominant hand for things, no. Maybe most people do lean toward using their dominant hand for everyday tasks, but I think it's a matter of habit for most things. "Non-dominant" doesn't mean "nearly useless".

I would say it is a bit strange for your friends to pay a lot of attention to which hand you use to unlock doors.

It's not really your "off hand" any more, is it? You just need to understand which hand is dominant now.

I'm right handed.

Shoot guns left handed because my left eye is better.

Fishing, when I was a child I had to learn how to reel left and cast right handed but at the time reeling with the right hand seemed more natural.

Shoot basketballs right handed but I used to practice with my left hand nonstop because I felt that most people only had one handed games, if you could drive to left or right right of the hoop, many times people asked me if I was lefty.

I think that's normal. I'm right-handed, but I have my phone in my left pocket and tend to use it in my left hand when using it with one hand. Last week I also had someone ask me whether I was left handed because I used my fork in my left hand to hold the food still and my knife in my right hand to cut the food. I honestly never think about these things, they just kinda happened over time because it worked for me. In my experience my dominant hand is obviously better for most things, but in the end it's also a matter of training. If, for whatever reason, I use my non-dominant hand for something repeatedly instead of my dominant hand then my non-dominant hand will get better. It's just that the dominant hand improves faster and has a higher "skill ceiling" in my experience.

Every guitarist:

No.

I bet everyone is hyper-conscious of which hand they are using to do what right now.

Not every post here has to be about masterbation.

I wanted to be ambidextrous when I was young, but i didn't want to work too hard on it. So I just intentionally use my left hand on most things and that led to a habit. I still write with my right hand, but I mainly use my left hand for most stuff.

I'm left-handed, but I always use a mouse or other pointing device with my right hand.

I dont think hand dominance is universal, at least not with me it isn't. While I am right handed most of the time, there are a fair number of things that I either prefer doing left handed or cant do right handed. Eg. I can't use chopsticks right handed. In fights I prefer to block left handed etc.

It's normal for me, but I've been close to blind in the eye that matches my dominant hand for most of my life.

I use whatever is most convenient at the time. The dominant hand is only really dominant in dexterity. Writing, using chopsticks, throwing stuff, uh... That's really all I can even think of that I can't do with both hands equally well 🤔

You may have a measure of cross-dominance or ambidexterity. Most right-handers use their left hands in a more assistive way, such as helping to balance a heavy object that the stronger right hand is holding.

Cross-dominance is where which hand is dominant depends on the task. That may describe you best. It sounds to me like for strength-based tasks, your left hand is dominant.

Ambidexterity differs from cross-dominance in that for most tasks you don't really have a dominant hand, and can use either.

It's also possible to be a mix of the two. You could have certain tasks you only feel comfortable doing with one or the other hand, while others are comfortable with either.

(Source: Am an ambidextrous guy. It's not the super power some people think it is.)

I have wrist repetitive stress issues, so I mostly just use whichever hand hurts the least. It does take a bit of conscious effort, though.

I'm right handed but I usually hold my phone with my left hand.