Hi, I'm an 18 year-old Asian with a smaller-than-average penis. I only measure up to 4 1/4" when hard. My girlfriend never complained, but the physical complex has been nagging at me for quite a long time, and since my body didn't do its job, I decided to take my own measures. I'm hoping to grow to 7.5", and worry about the girth later. Do you guys think that's unrealistic? What kind of exercises/workout plans should I stick to?