For several personal reasons, I suspect that my dad put a keylogger in my computer and was trying to keep an eye on what I am doing online. I am a bit fed up with him as he overcontrols me too much. I can't tell exactly wich keylogger he uses. I'v heard that some keyloggers are completely undetectable, that's horrible. Plz, is there anyway to detect the keylogger in my Mac?

Try reading through this:

 

http://mackeyloggerprotection.com/

 

You can use Activity Monitor (Applications->Utilities) to look for any suspicious programs, then Google the names to see if they're legitimate or not.

Thx for your help, Cap'n Refsmmat