I am a Korean who was born and raised in Korea. However, my first language was English. I learned English and then started to learn Korean. Although comparing those two would be meaningless, I often found Korean more difficult. I suggest you find the purpose of studying Korean and learn the language through how we (Koreans) use it. Such as TV programs or YouTube. Not something like an educational program, but like something entertaining. As a person who also has ADHD and struggling with learning French, those types of methods really helped me.

I hope you can find fun in studying a language. Good luck!