@hellomiakoda I’m the same. I am completely self-taught with keyboarding. Fortunately, keyboarding was an elective class at my school so I never had anyone teaching me the “right way.”
I could probably improve my technique by sticking more to the home row and being more conscious of the nubs on the “F” and “J” keys (on QWERTY) and increase my normal rate from roughly 100 wpm to maybe 110 or 120 wpm, but typing speed is not the thing that I need to optimize if I want to get more things done in a day.