Well it is not the opening's fault that you missed basic tactics and don't seem to think that your h-pawn has any value.
It would be easier to help you if you posted your thoughts instead of computer analysis. In fact turn off the machine altogether until you can spot things like 11...Nxe5 12. dxe5 Qa5+ on your own. The incredible bouncing assessments are not helping, you all ready know that the problem is poor tactical vision. In order to fix that, you have to work on pattern recognition and calculation.
So, my advice is to do tactical puzzle after tactical puzzle for the foreseeable future.
I have played the Caro-Kann as my main opening with the black pieces almost since about 2 or 3 months after I first learned chess. I have gradually learned more lines and variations and my results have been reasonably good against players at the same rating as me.
At my OTB club I usually play against a guy who is about 300 points higher than me (about 1400 Elo). I would describe him as mostly a positional sort of club player. He usually plays Caro-Kann Two Knights variation with the white pieces. I have probably played that opening variation with him about 10 times over the last few months and lost every game. Some of the earlier games were due to opening blunders. I reviewed each game I lost and looked at different opening moves that I could have made. I am now able to at least survive the opening and reach an equal position going into the middlegame, however I am really not doing well in these middlegames.
According to the engine almost every single move that I made in the middlegame was a mistake. The eval bar jumps up and down with every move as if each player is trying to lose. I know that the engine is better than the World Champion and will always see things that humans cannot be expected to see, but it is still disheartening to see mistake after mistake after mistake when you had tried your best.
I am not sure whether this type of middlegame really suits me or whether I can ever get good at it. In other games, usually when I have the white pieces, I tend to get nicer middlegame positions and have better winning chances.
I have heard that many players often blame their losses on their opening and are always switching from one to the next in futile hopes of changing fortunes. So I don't want to fall into this trap, but after so many consecutive defeats with the same opening variation, I am wondering what I can do.