English equivalent of מסגרת, used to describe a person who gets along in a routine with a rigid routine, responsibilities, etc
I'm not a structured person/guy.
It's succinct and I think it has a nice parallel with the Hebrew word for frame used figuratively.
structured (adj.)
following a set method, arrangement, or pattern m-w
Having and manifesting a clearly defined structure or organization Collins
If you're happiest when your day is planned out, with lists of things to do, and a tightly-packed schedule, then you like living a structured life. When something is structured, it's arranged according to a specific plan. vocabulary.com
Sometimes I can't believe I have become such a structured guy, given my island heritage and my tendency to want to relax without a lot of demands. ref.
Structured — non-structured. Structured individuals are precise and formal. They tend to be self-controlled and don't like ambiguity or lack of organization. Non-structured people are informal and casual, tend to be tolerant of others and have a relaxed manner. ref.
The methodological abilities are the required skills to organize and enhance a personal work. A structured person follows specific order to carry out activities in the short and long term. ref.
My attitude toward cooking could well be the reason why I did not stay long at all in that restaurant job. I tried to follow the rules, but to be honest, I found it boring most of the time ... Although I consider myself a structured person to some extent, I tend to like freedom, variety and creativity. ref.
An English phrase for someone who likes routine is a creature of habit, so you could say that you’re not a creature of habit.
This has the merit of not suggesting anything negative—or positive—about how you actually live your life.
This NGram link offers a variety of quotations about “creature of habit,” most finding it undesirable to be so.
This idiom isn’t terribly succinct, but it does suggest the sense of a frame — a boundary:
color inside the lines
To think or act in accordance with set rules. Likened to the way a child is encouraged to neatly color within the lines of a coloring book.
That poor girl is so rigid. I think she’s only capable of following rules and coloring inside the lines.
Conversely, we have:
color outside the lines
To think or act in a way that does not conform to set rules. Likened to the way a child might color outside the lines of a coloring book.
My coworkers don’t always understand my ideas, especially since I like to color outside the lines.
So:
I’m not a color-inside-the-lines person. I like to color outside the lines.
If I understand the question correctly, you could start off by saying something like "I am a free spirit." and then add something like. I won't be pigeon-holed. I would hate to be tied down by..." and then you would give some examples of such ties which you would hate - e.g.
"I would hate to have a nine to five job, a wife and children, and a mortgage."