2 yr old Speech Delay, Mommy guilt

My son turned 2 in May and has been diagnosed with a speech delay, otherwise he is completely normal. I have him in speech therapy and Ohio’s early intervention program for speech. They mostly have been telling me to work on play and engagement which will lead to speech development. It is like I know exactly what he wants and he uses gestures and he is social but he doesn’t have much of a vocabulary. It’s like I wish I could go back in the past and do something differently, I just feel so bad 😔 has anyone else had a similar experience? I am happy we are doing things about it but I feel like I did something wrong. I keep telling myself to snap out of it because it’s about him and not me. I just wish he was talking already, it’s killing me. I know people go through much much worse but it makes me so upset everyday.