HAVE NO FEAR, A GAY MAN THAT WILL TELL YOU THE TRUTH IS HERE!
Honestly, while I viewed your pics, I felt naughty, and paranoid that the internet cops would get me. The pics are a bit immature and all look like shots someone took of a teenager after school. They also look too staged.
You need to MAN them up considerably if you want them to convey any masculinity or sexiness at all. I mean, the one of you in the red shirt, literally looks like a school photo.
For starters, lose the trappings of highschool: the jerseys, the football, and the oversized polo shirts. A lot of guys manage to make their sport a prominent feature in their profiles and maintain there maturity by posting "action" shots of them playing that sport. Those are real sexy. And you could even include some stills of you at a field, but try not to look too posed. Remember, these pics represent the real you and need to feel natural.
I'd suggest you begin with some new pics that include you working out and lounging around. Action shots are usually the best for younger guys with athletic builds like you. Posing, I think is better suited for the big muscular guy. But, a guy like you, posing looks awkward and unsupported. You are young and spry, your pics need more movemment than that.
P.S. I guess I forgot to suggest that if you really want to pose, you could go all editorial with it. Tweek the lights and camera settings to create a mood, add some accessories,and try to control the background in your picture (consult my profile, I have pics like this). In a pic like that, even the football gear would have a rigthful place because it would seem more like a creative statement instead of a costume. Also, closeups that lack the typical "cheese!" expression create a good leaning toward an editorial shot.
LOL, not done...the three photos already on here are good examples. EricLA...looks to have controlled the ligthing in his pic creating a tinted sorta sultry look, Sporty_G's pic looks to be an action shot, something that was happening right then and not staged. And Timberoo has a closeup shot that utilizes an actual expression on his face that could be perceived to emote many different things, unlike the standard "cheese!" smile.