Precisely, you find it no different or difficult because it is your native language! I would think the same as you if someone told me they can't pronounce a particular sound in Spanish, and it's only normal. When we learn a new language, we struggle. In my case, this sound does not exist in either Spanish, English, French or Italian, which are the languages I already speak... so yeah, it is difficult for me. And, as a linguist, I can assure you that ы is not pronounced the same as the i in igloo. It is represented with an entirely different phonetic symbol. But I am already getting the hang of it, and slowly improving. I will continue to practice! Greetings!