we can't stop you, but you need to think about some of the things you've written: I don't think that your mum ever would "get over" your death, because she would feel that she had failed you in some way. Maybe your aunt doesn't want to look after her, or maybe your mum wouldn't. Do you have the right to make these decisions and assumptions for other people?
What if there isn't any "goodness" waiting for you? What if when you're dead you can't know or feel anything else? It's a bit late to change your mind, isn't it? I don't think it's your time, because part of you is still holding onto life: you're telling us about this, you're making plans for your mum (but have you asked her what she wants?) and you're trying to convince yourself that your death will make everything better, but you can't know this for certain. You need to talk to someone about your feelings and get help. please do that, Lu, hugs xxx