So as the title says it, when I say run I mean like just leave everything behind and start a new life. How do people do that? Just grab and go?

To clarify, I'm in a loving relationship, have two kids and have a decent job. Thinking this way makes me sound ungrateful even to myself, but it is the truth. I spend most of my time giving and giving, and sometimes it is reciprocated but the reality is that being a good mom, a good manager and a good partner are mostly thankless "jobs". I do everything with love, and don't expect anything in return but sometimes I just wish I could leave, litterally start running with no real destination, until I can't run anymore. Obviously, there are many people worst off than me, and I'm thankful for what I have. Wanting to just feel happy and have no worries seems like a given, but I just don't feel this way. Anyway, I don't have anyone I can share this with, and thought that maybe getting it off my chest would be helpful.