I think people are painting a doom-and-gloom picture here which is incomplete.
There is no question that the OP has really damaged their career, but stating that it's "all over" and they have no chance is overly dramatic. More realistically:
1. The OP needs to be on their best behavior going forward, without further problems.
2. They need good grades and step scores. The stronger their application other than the academic dishonesty, the better.
3. Some fields will simply be unobtainable, regardless of what the OP does.
4. They will need to be open and honest about this in their application. Own up to the mistake, and make amends. Anything they can do to show that they have learned an important lesson will help.
5. Apply broadly. Some programs will throw your app in the trash. Some might be willing to look beyond a mistake.
6. Once you are in residency, much of this issue goes away. You might still need to report it for licenses, but by then 5+ years will have gone by and as long as you don't have further problems, you should have no problem getting a license.
So, you will now need to work harder and do better than your peers to get a spot. If your current performance in medical school is down at the bottom of your class, or if you can only imagine yourself as an orthopedic surgeon, or if there are other red flags that you are not telling us about, then yes you should consider alternative careers. If not, and you're willing to fight for it, then you can still succeed.
