I'm really surprised at how many posters are adamant that expressing any negative emotion is unwelcome around them. I don't think I'd want a marriage or a household in which I could never express anger or frustration unless I was alone, and I'm pretty laid back, so hardly venting Basil Fawlty style about every little thing.
My children have never been taught to suppress their anger, and have been shown that letting emotions out as a roar/shout/request for help can be a much better alternative to lashing out, or bottling it up until you're alone, or trying to process it without allowing themeselves to feel it.
I'm also surprised how many posters never share negative experiences with their partner, even if it's just for the camaraderie of being annoyed with something together. I like the fact that my husband and I can vent about niche aspects of our lives and understand each other's frustrations - if someone annoys him, they go on my mental shit list too, and having each others' backs in this small way is actually probably more of a positive in our relationship than anything.
I also believe that it is possible to be angry near someone without them being negativly affected by it - I can empathise with the frustration of things not going someone's way without feeling responsible for that and it really surprises me that so many people automatically assume that they are the subject of any passing rage. So, whilst I acknowledge that clearly that's not the case for some people, maybe even most people, I don't think it's completely universal.
All that is to say, OP, that you are not alone and I don't think it can be massively abnormal to be like us (I hope, though I've no plans to trade my husband in!) but clearly its nowhere near as unusual as either of us would previously have thought which is definitely useful to know! I hope all the insight helps you find a way forward.