Hi Bob

not trying to be obnoxious, but you mentioned you have tried over several days. I don’t know what this means as in how long this has been but I wouldn’t stop trying to get the open chords unless you have a definite handicap like arthritis. 

The reason I am questioning this is that the A minor is one of the easier open chords to make. 

7 chords, sus chords are great, but they bring a different voicing. So before making suggestions I would try to help by starting with how much time in you have trying to practice these. And, how many chords are you trying to learn at the same time? I think (not sure of your age) just enough to play a song is all I want to tackle at the same time. 

Bill