All of mine are small (anywhere from 165-118lbs) an I'm 268. One of them bought a pole for her house for exercise and just because and they all mess with it when we hang out... Because of my size and my severe lack of upper body strength, I can't do it at all and when I do people think I'm just trying to be funny. Recently though, all of my friends have gotten into hula hooping and I couldn't do that either. So I did my research, decided to buy a nice fitness hoop and have taken to the challenge of learning to be at least on the same level as them in something. I really like it and it makes me feel like we are on the same page more. Plus they come to me for information about fun stuff that involves exercise and I've even got them to join a team with me for the Color Run 5k
The point of me writing this is whenever I feel uncomfortable about my own "sexy-factor" around my friends, I try to find ways to put us all on the same confidence level. You will be able to fit into cute clothes in no time (you're on here so you're trying!), don't let the time it takes to make that happen make you feel like you're not pretty/good enough
Hope this helps
(And to answer the main point, I used to let me being the biggest bother me but recently decided that as long as I am making an effort to improve, I don't need to be upset about it)