Is a .380 enough gun??

No. You need at least a 9mm.
No. You need at least a .40.
No. you need at least a .357.
No. You need at least a .45.........a .44mag........a .500 mag......

There's always going to be somebody who's gonna tell you to carry a bigger gun. Carry what you feel comfortable shooting. I'm pretty sure no threat has ever said "That's only a .380. They don't hurt".