How to know someone isn't a smurf in any elo

http://i0.kym-cdn.com/photos/images/facebook/000/428/075/30a.jpeg

https://vignette.wikia.nocookie.net/smurfs/images/b/bd/Papa_Smurf123.png/revision/latest?cb=20130805130238

I only play on my smurf to play Yasuo or Lee Sin. If I say "I'm a smurf" it's just embarassing because you know there's like a 50% chance I go 0/10