This is a truth that will get you through many situations, including this one: nobody really cares that much about anyone else's situation. Your mom cares. Your SO may care. Your best friend may care. The rest, well, even if you tell them it will be the furthest thing from their minds within 30 minutes.
So with that said, tell or don't tell, it won't really matter. If you don't tell, odds are good nobody will even ask.
The most important thing you need to do is figure out WHY you didn't pass this year and make every effort to fix it asap. Your initial post suggests you either don't know what the problem is or are in denial about what needs to be done. Either way, talk to faculty and advisors you trust and make a plan for next year. Do NOT count on previous exposure to the material to save you because even if you make it past M1, there's still M2 and Step 1 on the horizon. If you don't make some big changes now, you'll just have to repeat again later and you don't want that.
In order of likelihood, I would consider the following as possible causes:
1) Everyone else studies much more than you think and you really need to step it up
2) You got behind early on and were playing catch up the rest of the year and didn't quite make it
3) You have issues outside of school that need resolving
4) Your study skills are woefully in adequate and you need to figure out a better way
5) You may have an undiagnosed condition that interferes with your studying
6) Do you have test anxiety that prevents you from doing your best ?
Just some things for self reflection going forward. I hope you're able to turn it around. You can definitely match into just about anything, though more competitive specialties will require a stellar performance from here on out and a good explanation for why this year went awry.