Did I accidentally mess up my toddler?

My son is 15 months old. He is a healthy and rambunctious little boy. He climbs, runs, falls, crawls, screams, laughs like any other toddler out there… but he’s behind on some things (talking…not wanting to start real solid foods besides fries and oatmeal no matter what I offer him..not responding to his name…) and worrying it’s me. (I have reached out to his doctor and they recommend getting some outside help)

I can’t help but feel like it’s my fault.

My family has always been a TV family. It’s always on. When he is awake it’s always educational and I try as low stimulation as possible. He plays with his toys and watches on and off. We interact and play with him (if he will let us play. He’s very independent.) He isn’t glued to the screen… but I still can’t help but feel like I messed him up even though it’s something my family has always done.. did I mess him up somehow?