2,5 years can't speak

My child is over two years old but still can't speak. He likes to babble, but I don’t know what he's saying. He also isn't able to express what he wants very well yet.......... Even though I often talk to him or teach him words for objects or animal names, sometimes he can only say one word. Do you worry about this, mom? It makes me sad when he is compared to others who are already good at talking, even though they're younger than him. Has any other mom experienced this? What’s the solution? Is it my fault?????????????