FP ....you absolutely have a "standard" battery. That is, if it is the original battery, and not one that was added by a previous owner
The 12V AGM is a specialized "absorbed glass mat" unit with calcium lead plates that allows for long term discharge draws in the case of trolling motors, winches,etc. and are extremely $$$$$.
12V gel cell, are like the Optima batteries which actually could be installed upside down and still work great. Very often used in "marine type' applications.
Hope this helps........