Hard time getting toddler to eat!!

Guys I'm going CRAZY. My toddler only wants to eat when he wants. Not only that if I give him something one day and he eats it and enjoys it, and I try to give it to him again 2 days later he'll completely throw it from his tray. If I try to play and force it in his mouth so he can taste it he'll close his mouth shut. I'm going crazyyyyyyyyyy. He only wants to eat quesadillas, and anything thats puree. Hes going to be 2 in December. Idk how to get this picky eater to officially eat solids 😭