It is ok to be uncertain and to not know. Insisting on iron clad absolute certainty is a mind killer.
Approach the problem, the academic science, from the scientific method. Become a scientist.
Find a small slice of bioscience to study. Say wild flowers or birds or butterflys. Make yourself a semi expert on some small slice. Go into the field as often as possible and observe your area. Take notes on your observations then read a little on exactly what you saw. If possible, get a buddy to go with you.
Once you begin to really see what's out there as opposed to reading what others tell you or hide from you or just plain lie about there may come revelation born of your own eyes and mind and study. You will see for your self the individual differences that produce species and genera and families.
A Peterson guide, some binoculars or a magnifying glass and a good hard bound notebook are very cheap. A frequent stroll in the outdoors be it a city park or some wilder area is great recreation and best of all, it is cheap.
See my profile for some of my studies. It's easy to be an expert, just find something you like and apply your mind and talent. You have a lifetime so there is no need to hurry.