I am 12 years old and I said "oh my Lord" AND "OH LORD".
Is this considered shirk or am I disrespecting Allah?
In Islam the one and perfect name for God is ALLAH. There are 99 names of Allah.
Allah the Almighty, says in the Qur’an a kareem: ‘Wa lillahil asma’il husna fad’uhu bi ha’ ‘And to Allah belong all the best names, so call Him by them’ [‘al A’raf; 180]
Although if your intentions or words of saying LORD is for Allah then its not a Sin but in short Recommended way or u should say the word Allah or others beautiful names.