Im having small nipples will it become a problem to feed my baby in future
Absolutely not. They change in size, shape, and color while your pregnant, and when you start nursing they change even more. They'll look nothing like what you started out with by the time you're done, lol. :) Also- it's not the size, so even if they DON'T grow, you'll be ok. The mammary glands are inside your breasts, the little holes the milk comes out of are just as effective in little nipples as they are in large.
No, any size nipples will be able to feed a baby. I also had (notice I said had) small nipples. When I breast fed my oldest they got bigger.