I have added the rewritten, correct sentences underneath your original one. I corrected for grammar as well as to make it sound more natural.

Shopping based on demand

Phenomenon: owning to the foods only consuming by myself, (I am not exactly sure what you mean here)

it’s easily buying too many foods if I just buy the products based on my preference.

It's easy to buy too much food if I just buy the products based on my preference.

Many foods are not fresh and even corrupted/broken before I eat.

Lots of food isn't fresh and even expired/bad before I eat it.

So I want to make some criterions/rules to help me rationalize the action/behavior.

So I want to make some rules to help me when I buy food for myself.

(rationalizing action/behavior is not incorrect, but it sounds odd in this context)

Grocery: make a list and identify the absent foods,

Grocery: make a list and figure out what you need to buy

(to say "absent food" is not grammatically incorrect, but it sounds unnatural)

for the food bought passingly: (I'm not sure what you mean here)

assume/suppose the food already in the list, considering the consuming speed.

Assume the food is already on the list, consider the speed that you will consume it.

Once clarify the things want to buy, only go to the corresponding area in the groceries.

Once you figure out the things you want to buy, only go to those sections at the grocery store.

My roles.

As I am getting older I start thinking about things I had have done in the past. I’m sure there were are plenty of things I can be sorry for. For example: offending someone, wasting time and money, loving someone who didn’t deserve it, not taking advantage of good opportunities, or simply not being nice to someone. At the same time, there are many things I can be proud of – working hard and supporting my loved ones, taking care of my kid child (it's not wrong to say "kid", but with the tone of this text, "child" sounds better) and parents, being patient with them, being honest and delicate tactful at the same time, if it’s possible. And being independent. Don’t forget, it’s very important to be independent.
Thinking about my life I realized that I don’t have to regret the past. The point is without the mistakes I made, I wouldn’t be able to become what who I am.
Speaking of my life roles, I can say that I am used to juggling a few things at the same time. I’m a loving and carrying caring mom. I’m a cheerful and beloved wife, at least I hope this is the truth. I’m an auditor and chief accountant. I’m an ambitious and hardworking student, who is studying English not only for travelling, but also for moving to another country. I'm also an opera lover, and a dancer, and a person who is interested in politics.
Sometimes I can be harsh and critical; this is from shortage of free time. But my family prefers me to be lazy and carefree.
I’m not sure it’s great to be that way. But I am what I am.

Your text is very well written and very interesting to read! Good job!