I go to the gym consistently(4 years now) and have built considerable muscle and am overall fit. But I see people around me who recently started working out improve their style, dressing, hairstyle and overall looks, and it does look good on them.

However, I haven't been able to do that ever. I just don't know how to. Even grooming for me is just taking a shower that is it just to maintain basic hygiene.

Where do I learn how to style myself or what clothes would look good on me? And where should I start from?