I'm honestly thinking my best friend needs to grow up
Were you friends because you shared similar intrests?
I'm no longer like him. I think he should be more independent.
It's okay to expect someone to be more mature especially since you've matured. If he doesn't listen then you should move on. Sometimes friends grow apart.
No, he's immature and has no responsibilities. Sometimes I'm just jealous of him.
Not having responsibilities doesn't give him an excuse to still be acting immature. I think you're right in wanting him to grow up. If his lifestyle makes you jealous maybe you should look for more mature people to hang out with.