You tell us that your problem is nothing to do with your computer.
Having said that you give no details of the computer, (DxDiag) so how can we tell what the problem is?
It is quite pointless to compare SSE with Flight simulators as this is not a valid comparison. Surprisingly enough many players, including myself, can play the game remarkably well. That being the case it does seem to make little sense of your complaint.
I think that possibly your machine is not up to playing SSE, but of course, how can we tell if that is, or is not the case. Have you got the Collectors Edition or merely the basic game? Have you updated your game to the latest level? Have you purchased all the CCC ships, have you loaded the FREE pilots add on? Etc, Etc, Etc. If you were to be more specific in your rather unpleasant complaint it is possible that somebody might offer a helping hand.
I apologise, I see from the price you paid you have the Collectors Edition so then all the updates are there in your game, this further suggests that your computer is not up to playing the game, I'm sorry to say. Feel free to get back and throw abuse at me, I have a thick skin.
Traddles