I have a terrible complex!
Well, I think that working out is the best way of making your arms bigger, But, don't be obsessed with a gym: make a schedule of your trainings. Also it would be nice if you develop or just google a good protein diet. Good luck!
I say, first of all change your attitude, and only then make your arm bigger. Many people in fact like skinny arms, even in men
I like big arms only if they fit to the body. Slim guys with two bulk pillows on the sides are very unattractive.