Why not consider wearing a white dress shirt and black ripped skinny jeans? These pieces are very comfortable and will look amazing when paired together. If not sure as to the footwear, add a pair of white leather low top sneakers to the equation. This pairing should clear any doubts you had about dressing casually as a young guy.
Reach for a white dress shirt and light blue ripped skinny jeans for an off-duty menswear style with a clear fashion twist. When in doubt about what to wear in the shoe department, stick to a pair of white leather low top sneakers. If you're not sure how to dress age-appropriately while looking stylish, this combo is an amazing example.