I inside, I outside

I read an interesting quote said by the French mathematician and philosopher René Descartes “I think, therefore I am”. I agree somehow with this quote, but I think it is missing some important parts like “I perceive”, “I reason”, and “I feel”, because as humans we don’t just think, but we also perceived the things that surround us and natural phenomena that happen, and then we analyze them; and we feel things.
Maybe this is what Descartes was thinking when he said that quote, the “think” include the perception, reason, and feel part. But we will never know for sure, he was in another époque, where life and thoughts were different.
This quote has been criticized by various philosophers, like the English David Hume, because of the use of “I”. “It thinks” exist, because animals also think, of course not like humans, but they do. Therefore, Descartes quote using “I” was ambiguous, it let us think about it and analyze it. I think that, somehow, this is good because there are many different conclusions and thoughts concerning the quote, and you can see many perspectives, and may agree or not, you learn something.
An hypothesis, an ironic one that surely not everybody will agree, thinking about the époque, is that intelligent and reasonable people that use their brain are really persons, somebody, while dumb people of the time are just there, not meaning a lot. This hypothesis sounds a lot racist, I don’t think it is really true, but one never knows…
Another one, maybe he thought that people that use their brain, an essential part of the body, for thinking can be aware of themselves, others, and things around, so they are kind of sure of their existence, of them in the world.