I wonder if i am Ao or Ab or Ac. How can I find out?
You can get genetic testing done (wrong in my case, but I went the cheap route).
Or one can analyze relatives.
You are not Ac since that is not a normal blood type.
You are not an Ab, or your blood type would be AB instead of A.
If you know that one of your parents is an O, you would know that you are an Ao.
If both of your parents are an A. Then you would need to look at your parents parents. You can then work it out
Going the other way, if you have any O or B children you know that you are an Ao.
If you have no children, A children, or AB children you cannot tell.