Youtube star Jake Paul admits he was very surprised when five division world champion Floyd Mayweather called him out social media for a 2021 clash.

Mayweather was scheduled to face older brother Logan Paul in an exhibition fight on February 20th, in a pay-per-view main event. The contest was officially postponed, with a new date being worked on.

Mayweather had another exhibition fight scheduled to take place, against an unnamed opponent, on February 27 at the Tokyo Dome in Japan - and that event was also pushed back, due to the coronavirus pandemic.

Jake Paul (2-0, 2 KOs) is set to fight MMA veteran Ben Askren in a sanctioned boxing match on April 17, on pay-per-view.

While Paul is interested in fighting Mayweather, he doesn't seem interested in doing an exhibition fight with the 43-year-old. 

"I'm 2 and 0 with 2 KO's with pro fights," Jake Paul told TMZ ... "If Floyd wants to do these exhibitions, ya know ... cool. But, I'm a real fighter. He has to take me seriously and I think the reason he wants to do these exhibitions is because he's afraid to risk his legacy of his 50 and 0 record in case he were to lose."

"But, I'm not doing the exhibition sh-t. It doesn't interest me. Those are like fake patty-cake fights."

Jake Paul found it strange that Mayweather has yet to face older brother Logan and is already calling out several future opponents for exhibition fights - including rapper 50 Cent.

"This guy is out of his mind. He just calls me out, out of nowhere -- same with 50 Cent! I mean, he hasn't even fought my brother yet. It just seems like he's losing his marbles ... like what the f--- is this guy doing?! It just seems like this guy is money hungry. It seems like he hasn't paid his taxes or some sh-t and he just wants to fight everyone," Jake Paul said.