I suspect you're being downvoted because you'll always be able to claim 'No no, I meant more subtle effects that are harder to measure.'
To answer your question: How can I compare my vaccinated self to my unvaccinated self?
The answer is: I can't, because my unvaccinated self is probably dead as it would have had to have lived in a world where childhood mortality was much higher than it is now, due to various factors but especially communicable diseases.
To answer your question: How can I compare my vaccinated self to my unvaccinated self?
The answer is: I can't, because my unvaccinated self is probably dead as it would have had to have lived in a world where childhood mortality was much higher than it is now, due to various factors but especially communicable diseases.