Why does everyone hate their sales job?

I don't mind it but the thought of working sales for another 10 years is frightening - I don't really want to work anywhere for 10 years though haha.

I actually don't mind selling for myself and when I ran a business my sales people loved their jobs - do you think it's the stress and toxicity of sales?

For me it's the fact that it doesn't keep my brain active enough.

Starting a new business soon and getting out of my sales job - super supportive boss - anyone want to leave their sales roll and join me? (Partially joking, will need people eventually though)