Often, we need to admit that some people are much more excellentbetter than us because some excellenceskills seems to be innate, and we won't achieve itbe as good, no matter how hard we try.

It doesn't matter though, and; the key beauty of this world is diversity.

It doesn't matter, though, and the key beauty of this world is diversity.

The extra comma before "though" is just for conventions' sake; I don't know exactly why this has to occur in English, but it does.

A Random Thought

Often, we need to admit that some people are much more excellent than us because some excellence seems to be innate, and we won't achieve it no matter how hard we try.

this entire sentence is correct but this is how i would write it:

We often say that other people are better than us because of they can do something with little effort (innate talent). We then lament that we won't achieve things no matter how hard we try.