If you are given a chance to bring back the past, which one would you want to change?

Hi there, [이름]^^,

I hope that you are feeling better now.

I can say that you are right in not regretting anything in your past.

Let\'s live and enjoy now and strive more for our future, right?^^

Thank you so much for taking time in answering your homework.

I really appreciate it.

I did not regret my life in the past.

>>I don\'t regret my life in the past.

However if i had a chance to bring back the past, I would make my parents happy.

>>However, if I have a chance to bring back the past then I would like to make parents happy.

My family had a financial difficulties when I was young.

>>Correct!

But I just wanted to buy an expensive clothes, electronics anything that my close friends had without any consideration about financial situation of my parents.

>>I just wanted to buy expensive clothes, electronics, and anything that my close friends have for my parents without considering any financial matters.

I am sure that my parents had a lot of difficulties on bring up me and my sister.

>>I am sure that my parents had a lot of difficulties in bringing me up and my sister.

OR:
>> I am sure that my parents experienced a lot of difficulties in raising me and my sister.

I really feel sorry to them for misbehavior at that time.

>>I really feel sorry for them for my misbehaviors during those times. 

In retrospect, my parents allowed me to do anything that I waned to do without being mad.

>>In retrospect, my parents allowed me to do anything that I wanted to do  without getting mad.

I really want to pay my love back to my parents.

>>I really want to pay back the love that my parents had given me.