Thing is, most groups form a natural dynamic. If you look at most groups of people, you'll probably find that they've all got very different personality types... but they all bring something valuable and unique to the group.
For example, I'm not sure if you've ever seen the 1990's sitcom
F.R.I.E.N.D.S, but the 6 characters (3 guys and 3 girls) all have completely different personalities and characters... yet, they still had a very strong unbreakable bond, and I don't think they would survive without any of them. You had the geeky one (Ross); the good looking but "
simple" ones (Joey & Rachel); the quirky / flaky one (Phoebe) ; the organised one (Monica) and the career one (Chandler) . This dynamic was also emphasised a bit more recently in the teen drama
Skins in the 2000'-2010's.
Based on the above, chances are that's your role in your group... and TBH, it's a pretty good place to be IMHO (it's better than being "
the fall guy", who everybody laughs at and takes the p*** out of) . However, if you really want to try and change your persona, you can try dressing up or acting in a different way (I don't want to give specific suggestions), and chances are at least one of them will pick up on it... (and you never know where that may lead
)