My 3 year old!!

I'm honestly at a complete loss with my 3 year old little boy. He can be the sweetest little thing, but he just doesn't listen. and has gotten to the point of winning whenever i tell him no.
( like a hysterical whine but fake!) he's made it to where we can rarely go out in public, he can be that bad! ): I guess i just need someone to tell me it gets easier. 
side note * not any kind of discipline is helping or working at this point. ☹️