I see how vague my question is now lol. Primarily, I was asking why any part of the body made up of proteins would be alkaline, but now I know that it is not as simple as "amino acid = acidic pH".

So, from my understanding of what you wrote, amino acids have both basic and acidic properties due to the presence of a basic amine and an acidic COOH as functional groups (other than the variable R group)... Although it is ultimately the buffers in our blood that are largely responsible for maintaining a pH of ~7.4.

Thanks for the detailed explanation!!