Tips for high beginner with lack of concentration

I'm a beginner who understands the importance of opening, development, safeguarding the king and tactics.  I think that I do these fairly well.

But I have problems analyzing my own games.  After staring at the chessboard carefully for two minutes to make a good move, I lose concentration, my brain hurts, and I make quick moves after that.

I practice against the computer.  I could say "Make a good move.  Then leave and come back to the game later to make another good move."  But I want to increase my ability to concentrate so that I don't have to do that.

I find that I do well with tactics puzzles because then there's something new every time.  But this doesn't help me develop my skills in a full game from opening to ending.

Any ideas for how I can develop my skills to analyze every move?  Will playing against an easier computer player -- say level 5 -- really help, or is it better to do something like a level 7 player even if I lose constantly due to lack of concentration?

I'd say my chess rating is roughly 1000-1100

This thread contains a few tips on getting the concentration. https://www.chess.com/forum/view/general/how-to-increase-stamina-mental-endurance-during-slow-chess-otb-tournament

Do you have hard time concentrating in other areas, like studying, working etc? If not, then you just have to continue practice chess. As your knowledge grows, it becomes easier to quickly assess the position and find a natural move.

It may not seem like this is a promising idea, but I think a book like this is a plausible thing to try. Chernev (and other authors) try to help the reader to do something other than mere aimless calculating.