Regrets

I am privileged enough to have relatives who are living above average comfortably and are willing to help and finance my school expenses. Unfortunately, studying is was not in my priority when I was young and that's the reason why I have just finished secondary level school.

Good try, however you need to make sure you're using the correct tense in your verbs.

Regrets

I am privileged enough to have relatives who are living above average, willing to help and finance my school expenses. Unfortunately, studying was not my priority when I was young and that's the reason why I just finished secondary grades.