Diamond piercing on one or two ears?

I'm 15 years old. I recently got a diamond piercing on my left ear. It took a lot of convincing to my dad. It definatly looks a lot better and fits my personality. I like having one piercing on my left i think it adds "style" but every single girl has told me to get two. They want me to pierce my other ear, they say you need two. I honestly think it makes someone look like a girl, i need opinions thanks