Am I a smurf?

I have been playing since 2017 and calibrated into guardian shortly after I met the 100 game requirement for ranked. After calibrating I stopped playing ranked until about a year ago and mostly played ability draft. I still mostly play ability draft but have recalibrated and occasionally play ranked.

I have 60% to 75% win rates with all my most played heroes in ranked and have climbed to legend from the initial recalibration to guardian, while still maintaining a good winrate.

I have a 75% winrate with my platinum centaur warrunner as offlane through the archon bracket, and was around 80% through crusader.

I feel kind of bad because I figure I must be a higher skill level than the people I'm playing with, but the only way I can get to my own rank is just by grinding right? or should I make a new account and try and calibrate again?