I'm really worried about my daughter's mental abilities — she's 1 year…

I'm really worried about my daughter's mental abilities — she's 1 year and 7 months. Most likely it's just my own anxieties, and I stupidly end up comparing her to peers. We don't have much persistence; because of her temperament she refuses to repeat words and won't engage in developmental games. She won't use the potty and also won't feed herself. I suspect a speech delay (ZRR), but I hope it remains only a suspicion. I'm pinning my hopes on daycare and on your recommendations, or maybe you'll just tell me to let it go and stop overthinking everything ?