Any other parents of non-verbal kiddos here?

Yesterday was supposed to be my step kiddo's first day of school, but he got a tad sick yesterday so we decided to keep him home. We sent him in for his first day of second grade today though! He's 7 and hasn't spoken yet, but he's made so much progress the past few months. He's finally figured out how to put on his own shoes and pants, he has a tablet that he watches Sarah and Duck on 24/7 (he does not watch any other show, except Nathan for you, he loves Nathan for you every once in a while for some reason) and he's recently started playing sound clips through tapping certain parts of the play bar. When he needs a diaper change it's "Duck has a wet bottom" or when he's sad, he will get on his tablet and tap on the spot on the play bar to tell us he's sad. There are multiple small examples of this he'll do throughout the day and it's just so fucking amazing to see him learning to find ways to communicate so much better before he goes into school. He hasn't quite grasped the screen talking the school does with him, but he's started doing it through his show and I'm so happy he can finally advocate for himself to anybody that can hear. I just don't want him getting bulldozed by this worls because he's not able to scream "STOP" and doesn't understand the construction signs.

Other parents can chime in, this community is quite slow so feel free to comment any rants about your kid. But I'm curious if there are any other special needs parents here?

I know it doesn't compare to how he'll feel when he's older, but being the parent of a special needs child is isolating. While everybody else's kids are learning all these new books, maybe starting extra curriculars, I'm changing diapers, potty training and teaching him how to use a fork. There's nothing wrong with how long he needs to learn these things, but other parents just can't understand being on these topics for 7 years. It makes me feel like I'm alone, and it just spirals because it reminds me of how few people he has that can truly understand his experience. I'm only 22, although I was also non-verbal until I was 4-5, I have no experience on parenting, let alone parenting a child with special needs. I'm just scared that even with the extra experience I have being a nonverbal child, I won't be able to really understand enough to show him the love he deserves.

Maybe we'll be 20 years from now, and maybe he won't be able to tell me, but I'll just realize that I didn't have enough patience for him as a kid. There would be no way to know I'm actually apologizing to him, there would be no real way to tell if I was apologizing to him for him or just selfishly apologizing to make myself feel better. Like if I end up crying while apologizing to him, he will start crying. There is no way for me to know if I made his day better or worse by talking about it with him so I just never do. Anything I do with him is, for his sake, completely permanent. How do you guys handle this feeling?