I Act Older Than My Age

Maybe I used to, but idk about right now ahaha. I feel like I was more learned as a full-blown introverted kid. Like I could pass off as an 19 year old when I was 13. People online used to think I was so much older until I actually told them? I know I haven't completely lost that but nowadays I feel like I can be so immature sometimes. Maybe its cuz I have such high expectations of myself as a person and I don't always live up to it in terms of my actions. I do consider myself more mature than a lot of adults I know though. It's surprising how ridiculously irresponsible and immature some adults can be.