21 and feelin like a failure

Feeling like a failure I’m 21 and I’m seeing everyone I went to high school graduate from college and I’m just feeling like I’m doing nothing with my life. I finished high school at the age of 18 back in 2016 I didn’t know what I wanted to do with my life I was in the real world and was absolutely lost. I did one year of social care in college I didn’t give it my whole dedication I was 18 in college and my party life style took over. I left college at 19 I got a job in a hair salon (I always had interest in beauty) but I didn’t feel like I was doing what I truly loved. I started training as a hairdresser but last week my boss had to close the salon (due to her own personal reasons) and now I’m without a job I haven’t been happy in hairdresser I’m wondering is this a sign that hairdressing isn’t for me. I’m a caring person and really love helping people I’ve a big interest in addiction and mental health I feel like I’d love to go back and study to become a social worker. My mind is all over the place I just feel like I’m a failure. I’m 21 and doing absolutely nothing with my life. Am I too old to go back to college (I’ll be 22 since I can’t apply for a college course till next august as the college year has already started) has anyone else been in this situation where they feel like there doing nothing with there life??