Have you graduated college? I got my bachelors in 2016. 
I am still doing my bachelors actually. The term "bachelor" used to refer to a knight bachelor who was too poor or young to father vassals under his own banner.
Wow. I never knew that.  What other titles did knights have back in the day? 
A few other I can't think of right now. But by the end of the 13th century, the term was used by junior members of guilds or universities.
What types of guilds were there then? 
A type of guild that formed were known as confraternities of tradesmen. Which may be where the for fraternity was derived from.
What did the guilds do exactly?
Guild
A guild is an association of artisans or merchants who oversee the practice of their craft/trade in a particular area. The earliest types of guild formed as a confraternities of tradesmen, normally operating in a single city and covering a single trade. They were organized in a manner something between a professional association, a trade union, a cartel, and a secret society. They sometimes depended on grants of letters patent from a monarch or other ruler to enforce the flow of trade to their self-employed members,
levels in the framework (sometimes two levels where non-honours and honours bachelor's degrees are considered separately), although some qualifications titled bachelor's degrees may be at other levels (e.g., MBBS) and some qualifications with non-bachelor's titles may be classified as bachelor's degrees (e.g. the Scottish MA and Canadian MD).
The term "bachelor" in the 12th century referred to a knight bachelor, who was too young or poor to gather vassals under his own banner. By the end of the