In a lot of ways yes. We have the largest brain size (relative to our body), we can use tools and solve problems more effectively than any other species and have colonised every continent on the planet.
But we aren’t the biggest species in terms of numbers. There are several species of insect that have much larger populations than us, and make up more living biomass than us!
As for going extinct- it’s definitely possible. The dinosaurs were a hugely successful species but they didn’t survive the ice age. It’s possible that in the future a sudden change in climate could make it very difficult for humans to survive.