Why do parents throw responsibilities on kids when they become old ?

I don't know why ever since my dad passed away, my mother is on top of me and so are my relatives. I'm constantly being reminded about my age and where I stand in life. They keep saying you have to do everything fast now. Finish college fast, get a high paying job fast and marriage then settle. Sighs I know I'm behind in my life and I just don't feel mentally capable of making my family proud. I'm just not believing enough in my abilities. Pretty much all of my childhood friends are settled down in a way. Either they are married or they are working towards success for career paths. But in a way, mostly parents are proud of them. When I was young people thought I was the bright kid and will make a new for his family little did they know I would be the opposite. I sometimes question life like why am I getting all this hate and pressure for. I didn't do any wrong to nobody. I even took care of my father who got a stroke and even seen him passed away in front of me. I never had the chance to go therapy and I have not overcome social anxiety. My family thinks I'm living in anxiety and makes fun of me for being scared to face real world. Sighs