Young was joined by former England global Michael Carrick in geeing up the Red Devils in the dressing room after a woeful first-half performance saw City take a two-goal lead.
But United sprung a stunning comeback, with Paul Pogba scoring twice before Chris Smalling volleyed home the victor to delay City's title party.
The 29-year-old, who has scored 30 goals in all competitions this season, returned as a late substitute in the 3-2 defeat to Manchester United at the Etihad and was then took a high Young boot into his shin.
Kompany opened the scoring for City - who held a 2-0 lead at halftime at the Etihad Stadium - but United fought back to record a famous 3-2 triumph over their neighbours.
"That is the type of pressure these games bring on - can you as an individual get rid of those awful images and concentrate on the job in hand, or will you allow yourself to be drowned in such negativity that you can hardly warm up without it being on your mind constantly, and your warm-up is 25 minutes of bad touches and anxiety!"
"Every time they arrived they scored a goal".
"Beaten by your rivals at their ground and to then have to sit there and watch them lift the Premier League trophy - all of this while the home fans laugh at you there downtrodden, embarrassed, worthless, a beaten man/team", he wrote. We didn't talk too much about tactics, just about our pride. "If we had played like this all season, we would be in the top of the league". Are we going to stand for that?
"We need to thank them all", added the Brazilian. "We started the game really well, but we must return to the pitch as soon as possible because on Tuesday we have another big challenge to overcome a result".