Is this a sinful promise?

[Luke]

I've recently made a promise to god that I wish I could take back. In the midst of anger at my dad, I swore to god that I will one day leave the house and never see him or my mom ever again
(abandon them).

Though I do want to leave my parents, I do not want to leave them because of a promise I made to god ; I want to leave them on my own ,and I don't want to totally abandon them. For example, I would like to leave the house ,but I would also like to take care of and be in frequent contact with my parents.

I have been researching around ,and I have discovered that it is not allowed to fulfill a sinful promise in our religion.

The exact words I said were "I promise to god I will leave you and never see you again" ,and I would like to know if this is a sinful promise.

1. I can never fulfill this promise
2. I do not want to fulfill this promise as it was made while I was furious
3. I want to repent for this as soon as possible

My questions are
Is this promise I made a sin,or does this not count as a promise because I made it out of anger? I've herd that in Islam, the things you say while angry do not count.
If this is a sin, how do I repent for appropriately?

I cannot stand the fact that I said such an arrogant thing ,and I know I wont be able to live with myself if I don't make amends =[
Your help is immensely appreciated.