My Minecraft looks pixelated

I don't know but my cobblestone texture looks very pixelated when I'm coming nearer to them. And also, the outline of every block in the world looks very pixelated. When I watch the world from a distance, the views is not as I thought. It's very different than the Minecraft videos that I've watched from YouTube and images from other websites. I've also checked my graphic driver and it's already up to date.

Hate to break it to you but this is what vanilla (unmodified, standard) minecraft looks like. If you wanted any of the fancy crisp HD textures you have to download them separately.

Theyre in what are known as "Resources packs".

Go to a website like say, planetminecraft and download one, follow the instructions and you may run with a custom texture set. If your pc can handle, i recommend a HD pack.

Yep, that's exactly what vanilla (without mods) Minecraft looks like.

There are a bunch of resource packs and other mods to change the look and that's probably what you've seen in those videos you mentioned.

I recommend taking to Google to find the texture packs I've mentioned. Unfortunately mod recommendations are off-topic for our site.