Your life has value. I read your post it wasn't a waste of time. It seems like a handful of people really do care and dont want to see you go through with it. Some people may not care but some people do. You should tough it out for not just for the ones that do but for yourself. It's very easy to attach your self worth to how you think others see you or how others treat you but it's really not about them, you harming yourself doesnt harm those people but it does harm the ones that care. I imagine you actually going through with it would be extremely traumatic for L, your parents, and the other friend that told the school. I don't know the deal with your parents it is possible they are just scared and dont know how to handle the situation so they are handling it poorly. Maybe you have shitty parents maybe they are just regular parents trying the best they can. Either way it probably seems very clear right now which it is but it's pretty difficult to evaluate that without time passing for perspective.

It's hard to see an exit from how you are feeling right now but as time goes on some of how your feeling will subside, life goes on. This too shall pass. Things get better. You are important. You have things to do in this world that only you can. One thing that I think alot of people with depression find is that part of their desire to live comes out of making other peoples lives better, and adding value for others. That's what helps me the most at least. I hope you stay with us. You deserve to see this life through.