Sounds like you're in need of some inspiration~
Unfortunately, it's not easy to find: I really can't blame anyone for becoming bored when drawing guys because they are a chronically under-designed demographic. ^^; Like, even in fantasy worlds where you could have them wearing ANYTHING, their outfits often remain boring and utilitarian to stay as 'masculine' as possible. Because we all know color and style are only for girls...
Like, can I get on my soapbox for a minute about Xenoblade?? On the left is Shulk's original design, and on the right is his newest and most recent design for that Future Connected extra story:
And whenever I look at this sad progression all I can think is MURDER MURDER MURDER KILL KILL KILL
And now our newest Xenoblade protag looks like this:
IT HAS TO STOP. SOMEONE NEEDS TO BE PUNISHED...! TELL ME WHO'S RESPONSIBLE AND I'LL DO IT MYSELF!! (╬▔皿▔)╯
...Anyway * climbs off soapbox *
@RedLenai made a good suggestion about doing genderbends to try and get in the groove: take the care and love and actual creativity that goes into girl designs and try using them on boys. Y'know, if you're having trouble finding any interesting looking boy designs to use as inspiration (they ARE out there, though. Have faith and keep your eyes peeled).
Another thing you have to get used to doing is going against the norms yourself. ^^ Like, every artist learns conventions when it comes to drawing girls vs. boys; it's a normal part of development. But at some point, if you want to do new and creative things, you have to let go of them.
If you're sick of drawing guys in pants and shorts, start drawing them in skirts and gowns and leggings.
If you're sick of drawing them in penny loafers, start drawing them in heels and boots and fun sneakers.
If you're sick of drawing them with short spiky hair, draw them with longer hair, curls, waves, braids, accessories.
Yeah, it's not "normal", but it'll never be normal if everyone is afraid to try. Someone has to start...and if drawing normal boys is boring to you, you might as well have some fun and draw abnormal ones.
For example, here's some recent unorthodox guys I designed. And to be honest, this is pretty tame (it's a typical 'urban shonen' setting); when I draw fantasy guys I get a lot wilder~