I remember that he was by his crush and his brother made fun of him because his pant crease looks like a boner. Then later on the same unpopular boy went to to visit his cousins on the coast and met a girl and began to like her. He thought that they were cousins to but she later explains their are not and that they can be together. I watched it before 2010 probably on Netflix streaming services!
HottieBoombaLottie (2008)
https://www.imdb.com/title/tt1238293/?ref_=adv_li_tt
Yes thank you!!
Solved!