Oh Looking4, I have just read your post. I am so sorry about your Mum, and that you had to go through that terrible experience, as a 16 year old little girl, without, it seems, much support at all.
There are other people in real life and on MN who have experienced painful bereavements, and who will talk to you about your feelings. You have, as you said, made the first step here, describing your feelings so powerfully, which was incredibly brave of you.
You are completely right. Time is not a healer for many, and that pain will never go away altogether. But there are ways of dealing with your feelings, so that they don't have to be so overwhelming still. I think that you are saying that you would like to move forward now, aren't you?
The ladies (and one man) on this thread, have all recently lost partners, but many have children and would, I am sure, talk with you about your feelings. If you would like, I could 'introduce you' on their thread.
In real life, Cruse bereavement care is a wonderful organisation, which may have counsellors near to you. You are so right in saying that a bereavement can leave you stuck at the age at which it happened to you. A cruse counsellor will understand, and offer practical support to help you to move forward, when you are ready to do so.
I also recently came across this organisation Dragonflypin Bereavement which might be helpful for you. They sell lovely dragonfly brooches, which you can wear as a sign of a bereavement, and as a way of showing that you remember and still love someone who has died, but who is still very much part of your life.
I do hope that you read this. I am so sorry that no-one responded sooner - it's most unlike Mumsnet to miss such an important posting as yours.