Boys more likely to drop out of school

The above picture states that boys are 30% more likely than girls to flunk or drop out of school. Why is that? There are a few reasons I can think of that are linked to boys trying to be "masculine." From a young age, boys are taught not to never show their emotions, especially if it is crying or being upset. Maybe these boys that drop out are afraid to show that they are upset about their grades and are unable to convey their emotions in a way that could help them improve their grades. These boys also most likely do not want to show other people, especially other boys, that they are struggling and need help. Boys are always taught to do things on their own and to be a "big boy." So they may feel like they do not have help and are too proud to ask for help.
Any opinions?