Feeling like you did poorly on the MCAT is quite common, even amongst high scorers. Very, very few of my students have reported feeling good leaving the exam. Those that do feel good about the test, not many of them do as well as they had hoped. Point being, the test is stressful and we are really not the best judge of how we did.
With that being said, in the event the test did not go as planned, this retake strategy is really problematic as you will not have time to figure out where you need to improve (is it one section? is it timing? are there content gaps in one subject or many? was your reasoning off), figure out an adequate study plan to address those deficits (your prep since taking the mcat will largely put you in the same position you were on test day - you really need the feedback of a score to point you in the right direction), and seriously risk a second similar or worse score. This would put you in the position of potentially taking it a 3rd time. As Goro has put it elsewhere, the MCAT is like a marriage, its best to only have one, the more you have the more questionable it looks. For an admissions committee, having two low scores and then an improvement on the 3rd attempt, could be interpreted as growth, or could be interpreted as an outlier and begs the question - why risk it on this candidate. The AAMC leaves it up to schools how to evaluate multiple attempts but the AAMC recommends that schools average scores together. For this reason, if you are in the position of having to retake the MCAT, you want to go into that second attempt in the strongest possible position.
If you were one of my students, I would highly caution against the plan you outlined above. It is highly risky. I personally understand taking an unplanned gap year sucks. I did it myself when I realized my first pass at preparing for the MCAT was not up to par. While I wanted to get started with medical school and did not want to spend another 4 months preparing for the mcat, it ended up being one of the best decisions I made. Medical schools are not going anywhere.