Why are parents like how they are, even they know what we are going through, I try not to make a big deal of how they act like they don't know what's happening even though they were a child once, why do I feel like I'm living life alone.?

Parents should be there to protect you so even if you feel alone or down just know that they will love you no matter what happens even if you make good or bad mistakes. Parents can be a bit harsh sometimes but they are just trying to make you prepare for what is going to happen in life when we get older. So you should always love your parents even if they make you mad sad or even alone, Here is a task for you I want you to go up to your parents and hug them saying thank you for what you are doing to have a better life.
And parents are just parents gotta love them am I right?