You ain't understanding what's being said. Yes your coordination with keyboard and mouse is a problem, but not as big as fromsofts inability to make a good format for playing their games.

Use a damn controller for fromsoft games if you are new to k&m.

Also for how to get pretty comfortable, and I hate saying this because of where the company has gone in the last 10 years, but diablo and starcraft were great for keyboard and mouse training early. It's simple to use and will get you comfortable with it while having fun. Diablo 3 reaper and starctaft 2 v bots just practicing timing attacks.