Why dont i remember being 12?!

Well, calm down. I happen to be 18 as well.
A key concept here is association. You probably have memories of being 12, but you don't associate them with your 12th year of life. If someone said (for example), "Hey, remember that time when we were 12 and we experimented with large amounts of whiskey and a moderate amount of drugs, and you ended up swearing to all of us that you were actually a space alien from Mars, and stripped naked to prove it?" and you would say, "Holy sh*t, I realize that I actually had a 12th year in my life."
Even less dramatic memories are there, you just don't recall them being when you were 12. That's all.
So there you have it. Some people even claim (they may be right, but I'm way too lazy to do the research right now) that you have 95% of your memory intact, it's just stored in your sub/unconscious. It's a fact that hypnosis can bring out memories that you have completely 'forgotten'.
I'm sorry about your father.

Jakob

it seems your subconscious has blocked / suppressed the memories. This happens when something bad has happened in our life.. i explain more on the subconscious and how it can affect you on my site

www.georgiostheodorou.com

hope this helps.. if you want to remember you can do that with hypnotherapy.. if there is something that upset you at that age the therapist will deal with it and you will feel better.
Georgios

This is a problem many people come across at random points in time. It seems to me that your 11th year could of been traumatic because of a very unforchanent event. And your thirteen year seems to of been when you started puberty. You see when to major memories come together alot of times the memories in between can be cancelled out.

It was a very uneventful year. You remembered 11 and 13 because there was something significant about both of those years. You have what they call selected memory. You choose what is important to you and file it away in your memory bank. Being 12 was just not that important to you.

Consult me with your footprint and I will draw a graph of all the activities you did when you were Twelve. I can tell you when you pissed, when you farted, when you shat, how many litres, kilograms, Nm3. I will charge by the hour for consultation. My minimum fee is GBP 999. I am a MictoEvacuologist specialising in the neurological disorder of your kind.

at 11 your in highschool in the UK wtf. have you ever thought that your 12th year was just not that memorable you have listed different memories that were important to you at different ages maybe nothing important happened at 12 so it skipped your memory

most probably you did not encounter any significant events which made you forget every thing . or you do not want to remember it . enjoy your being 18 years . and more to enjoy for the coming years of your life .

Maybe nothing of real importance happened that year so your mind felt no need to make notes. Or sometimes when very traumatic thing happens to us are mind blocks them out to protect itself. I have no definite answers sorry.

i took your eleventh year as payment for that candy bar

you still owe me three years

You most have not been so exited about beigng 12 so you kind of bloacked it out.

extreme sexual abuse leading to selective memory loss

i abuse people

abducted by aliens you lost yrs or your going SENIEL