I'm ruining my own life

I'm 16, 11th grade. People my age are way more mature than me. I can't even take a simple responsibility of going to school.

I've been skipping school for a month without a proper reason other than saying "I'm tired" so my parents would get less mad, since I can't tell them I'm just being lazy. But that's kind of the same thing too, they're still mad and disappointed.

I don't even go outside when I skip school, I just stay in my room all day, and don't do anything valuable. I'm scared to go outside. I don't feel belong anywhere. I can't talk to people normally, it's just safer to stay inside.

Also I don't see how weak I am compared to everyone else out there when I don't go outside.

I know I have to pull myself together, but despite any type of advice I'm getting from people, I can't.