Real live versus picture appearance?

I am a 15 year old girl. I am 6 feet tall and my weight hovers around 210 lbs. For the most part , I am verycomfortable with my body. I am a big girl. I have a and . I also have large bone structure. I have a little pudge around my midsection and my inner thighs. If I lost probably 15 or 20 lbs, I would have a smokin body. That probably won't happen though. I am comfortable with myself. In person I really don't feel that big. I just feel normal sized. However, when I look at a picture of myself sometimes I don't even think it looks like me. I do not feel that heavy, but when I look at pics of me, I look a lot heavier than I think I am. I am in marching band and last summer and througout the marching season, I lost probably 15 lbs. I liked my body a lot back then. However, marching band was over the beginning of November. I kept the weight off for a little while, but did not keep a rigorous workout schedule. I gained all of the weight back during the winter months of january and february. I will probably lose weight again when band starts back up in august. I went off track, but in your opinion, is it normal to look different in pics in real life? Is it possible to look smaller in real life? I really do not feel that huge.