Short & curvy.. whats my ideal weight?

fitnessfreakygrrl

I've always been extremely short.. 4"9. Haven't grown any taller since junior high.. I'm 20 years old now and weigh 125 lbs. I'm very active - fitness and healthy living has always been very important to me. I have what you would call a "thick" lower body and am very curvy. I know that for my height according to bmi I should be around 100 lbs. However my clothes seem to fit well and I've never been told I seemed over-weight. Thinking that my weight is probably due to muscle mass but I'm just wondering if the weight is still to much for my body considering that a small frame can probably only healthily carry so much weight?
Any suggestions or remarks that could clear things up for me would be very appreciated!