I have a weird issue. I'm not actually sure if it is even a real problem because honestly, why looks in the mirror while they're in a relaxed position?

My problem is that while I feel cool, dress cool and act cool when I'm trying to impress somebody, but I can't help but feel like I'm not holding myself confidently. I feel like I either hold myself in a weak position or in a kind of dorky, cant-relax sort of way. Again, I'm not sure if I'm looking too much into it and would like some of your opinions, even if it's just about posture in general.