It’s a rather bitter sweet moment when parents scold you. You do not realise the importance of it, until you grow old and come to the understanding that what they did, even if it felt wrong during the time, was actually the correct move. But, being stubborn and not learning from the mistakes of past, you keep on repeating them and that sucks. 

I'm a little confused. If you are depicting childhood as the heavenly part of life, why are the specific instances from childhood you are evoking negative ones? Being scolded and bossed around by your parents is one of the worst parts of childhood, at least in my opinion.

I like the phrase 'a life worth dying for', that is strong. Same for 'thriving for a gasp', which is very physical and evocative at the same time.

ETA If you are using parents scolding as a way to mark growing out of childhood that would make sense, I think there just needs to be some kind of bridge that explains what you mean by those phrases.

Thank you very much for the honest review. Means a lot to me that you didn’t sugarcoat it. I will keep the aforementioned points in mind for the next poem I’m working on. 

While I like your idea, I think the piece still requires quite a bit of work. On the flow, but also the ideas within could do with some expansive imagery, and some of your word choice simply doesn't carry meaning, in my opinion. What follows is an honest critique. It's quite corrective - I'm a lot better at saying what could be improved than I am at saying what I like, and there was quite a bit in this that could be worked on to great effect imo - but I hope you won't be dissuaded by this at all. The piece shows a lot of promise and I wouldn't take this time otherwise, but I think the critique it calls for might be quite useful to consider moving forward, and I personally learnt a lot from taking the time to edit my work.

Your rhythm starts out strong, but falls apart after your father's prompting. I'd strongly urge you to revisit how you go from those two quotes into the rest of the poem. Similarly, those first lines carry an image we all can relate to, but don't seem to connect well

"Sit properly", my mother scolded 
"Don't eat that", my father prompted. 
Childhood was the heavenly part of life
And now it feels like a stab from a knife 
A cheer for the days where happiness laid stood
And dream of being everything that you could 
A life so simple that everything was in grasp 
And now every moment is spent thriving for a gasp
So, here's a cheer for a life worth dying for 
And a slap of reality that sadness evermore 

1. https://www.reddit.com/r/OCPoetry/comments/8a5yvk/comment/dwx2wed?st=JFO4OMV2&amp;sh=c4afbba9
 
2. https://www.reddit.com/r/OCPoetry/comments/89whkl/comment/dwx3bvr?st=JFO4UO30&amp;sh=329065b5