Never write the letter "Ю" after the letters 'Г, К, Х, Ж, Ч, Ш, Щ, Ц' instead use "У"
Hopefully someone more advanced can give you a detailed answer. But what I can tell you is that not all verbs relating to you (the 1st person speaker) end in ю.
I live - я живу I eat - я ем I go - я иду/хожу
It might be related to spelling or certain rules, I am not sure. Hopefully someone else can give you a clearer answer.