Let us be technical here.
Medical Doctor are scientists.
However, not all doctors are scientist.
For instance, lawyers hold a doctors degree--scientist they are not.
To be a scientist, you must either a)complete formal training in a science(like math, physics, psychology, medicine, economics(yes, economics is a science), chemistry, etc.) Or b) have contributed to a field of science, normally peer reviewed work. So, no you do not need a degree in the science to be considered a scientist! .
Besides that, you are an amateur scientist or hobbyist.