It's a good start. Think about what you hope to gain from sending this letter, as someone mentioned in a previous thread. Are you establishing boundaries? Asking for space? Is this to communicate your needs to your mother or correct her behavior? It would help us give you better feedback if we have a clear idea of what you're trying to say.
Life is too short to spend it walking on eggshells, especially for someone who could never stop hating you. And I have some things I need to say.
Is it supposed to say "loving" instead?