Re: "I" or "me"?
It is important to understand the difference between "not very natural" and "incorrect". If something is actually incorrect, we will say so. If it is grammatically correct but would sound (to a native's ears) rather odd, wordy, clunky or, in many cases, simply like it is being said by a non-native who has learnt a particular construction and is using it, then we will probably say that it doesn't sound "natural".
Remember - correct capitalisation, punctuation and spacing make posts much easier to read.