I have the feeling that the 1990's sitcom was a Ripp-Off that that 1970's sitcoms Happy Day's has it occured to anybody that Fonzy and Richie had the exact same personalities as Shawn and Cory i just had the brainstorm its amazing, does anyone else see the same personalities between both sitcom characters ???

Actually, yes- there are some similarities between Cory and Richie and Shawn and Fonzie. However, I would not call "Boy Meets World" a ripoff of "Happy Days" by any means. In any case, "Boy Meets World" acknowledged its influence from "Happy Days" with some pretty major references to the show on different episodes. There is one episode where Cory time travels in a dream to the 1940s and Shawn is essentially a greaser styled after Fonzie. (This episode also features Anson Williams and Tom Bosley making appearances.)
In another episode, Cory does an imitation of Shawn at a party, in an effort to be cool, and Shawn corrects him and tells him- "That's not me- that's Fonzie!"

(However, I generally find more similarities between "Boy Meets World" and "The Wonder Years" myself, for fairly obvious reasons.:) )