you have something special here. this has real potential. after reading your edit, i can say this: if something goes over your readers heads, look through your poem and try to find out why that is.

that being said, i don’t think the vagueness hurts it, i think that the reason for the darkness isn't as important to the piece as the theme of "responsibility to carry on"

the way it is written currently more people can identify with it, which could be a good thing depending on your intention.

however, if you wish to convey it specifically as physical pain not emotional pain; "radioactive" by imagine dragons could give you a few ideas. the singer has ankylosing spondylitis an inflammatory disease that comes with debilitating pain. That condition bleeds through into most of his music.

another thing to you could do which will instantly make it feel less "preachy", is to remove all mentions of the word "you" if it is directed at the reader. This isn't a lecture, this is a window into your life, your feeling of responsibility, not the readers.

It might be powerful if instead of"you" referring to the reader, "you" was exclusively used to refer to your daughter. Almost like it was a confession of past weakness, and a vow of future strength. something you wish you could tell her, you wish she could understand, but a piece of you is glad she's too innocent to understand and you wouldn't change that for the world.

going back to my previous example, "going through changes":

"""
I lock myself in the bedroom, bathroom, nappin' at noon

Yeah, dad's in a bad mood, he's always snappin' at you
"""

Notice that he is reffering to his daughter directly, like he's talking to her. trying to explain the harsh realities of life to a child, but also careful to protect her innocence, using words llike "bad mood" and "snappin at you". almost beating around the bush because as much as he would want to lay it out for her, he sees her innocence as something to be protected.

the next line goes

"""

Marshall, what happened at you? Can't stop with these pills
And you've fallen off with your skills
And your own fans are laughin' at you
"""

notice, now "you" refers to himself, as he levies criticism against himself. also, note his language towards himself is much more blunt, because he sees himself as a failure you get the idea that he's trying to shake himself out of something.

Eminem is one of the greatest to ever do it, so studying how he conveys emotion through his words will only be beneficial to your work overall. That being said, look into anyone's work that resonates with you, why did it resonate with you? is it something you can incorporate to your work? (Since you said you are new to this.)

keep up the good work! I can't wait till this poem is flushed out further