it's ti, it'll polish out, besides, scratches add character
yes, it's an MTB, that'll happen, you could clean it (or not)
what does this even mean? is it the same as dirty?
again, that'll happen if you ride it, either replace parts when worn or don't buy such expensive parts if you don't like the cost of replacing them*
*caveat for genuine race bikes, it's allowed to save them for racing.
Having said that, I've been through this (I think we all have at some point) but you need to realise the reason you are feeling like that is because it's a great bike, the next step is realising that great bikes need to be ridden, otherwise it's not a great bike, it's just a great ornament in the shape of a bike.
Look after it by all means but don't fall into the trap of not actually enjoying it as a bike!