Whats up guys, well unfortunately I'm pretty convinced my gear is underdosed

I just finished week 6 on my Test E @ 500mg per week. I've gotten a little bit stronger, and gained a little weight, but i'm pretty sure that is from having my diet in check and working out hard. My buddy is using the same stuff, and he has used Test E previously and he said he's not feeling anything, so I'm pretty convinced it's underdosed.
What should I do? Finish out the cycle? My sex drive is up, and I'm feeling a little bit stronger, but nothing a good diet and hard work couldn't accomplish, so I guess I feel like I'm in a bind, please give me your opinions.
Stats, 6'2, 190, 22 years old.