nno6,
Everything about life is in the translation.
Your father loves you and is trying to motivate you. His efforts are misguided but well meaning and evidence of your value.
You interpret his expression of concern as degradation of your human value.
Your mother would not be happier if you never existed. And she will never have happiness in her life if you end yours.
There is a clear single problem and more than one solution. The problem is that you are not motivated in school. The most likely solution is a tutor. You may need to change courses or direction of study. You should seek this type of help and direction through counseling at school.
Many people are depressed and don't know why. You're lucky in knowing the cause and its complications with your dad.
Write back and tell us what you do find interesting, what you might like to study or pursue as a career. Traditional schooling may not be right for you. Or you might not have the most stimulating teachers. Tell us.