Answer:

There is no exact reason why you did it although there are many reasons why. In my opinion, you triggered your depression because of the many negative things you have gone through. You may have been bullied, abused by other people, treated as a slave or an equal person towards others and also had low grades. These are one of the usual reasons people turn to depression and harm themselves.

Explanation:

Try talking to an expert or adult, they may understand it better, I'm still a teenager although haven't experienced depression but knows how it happens, try not to think of negative thoughts and only positive ones. Please mark me brainliest if this helped you.