If my life could restart, I would like to do ...

I am 23 years old but still a sophomore, therefore I am older than my classmates. I want to be at my other classmates age like usual but life can't restart. I have done many wrong things in the past, but i don't regret anything. I know life is full with right and fault,when i look back,those things is not as much important as it is before.
but here i just suppose my life can restart
If my life could restart, I would join up after highschool graduation and not work.
If my life................, I would choose another high school, because the school i went to was not good. The students were unfriendly and the teachers were not responsible. I'd like to be diligent in high school.
If my life could.........., I would like to cherish my love in high school, I wouldn't choose to give up easily.
If .........................., I would like to be diligent in my first semester of university life.
Finally, I don't regret what i did in the past, I know that what I do now and what I did in the past will play a important role in my bright future.


Good vocabularly and fairly good use of past tense! Here are a gfew pointers:
- Remember to put spaces after full stops/ periods (.) and commas (,)
- Capitalise I's 
- Watch out with using the present tense when talking about the past ie. is - are 
 
I would like to cherish my love in high school - Love of?