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? 
Guilds were usually organizations of a certain professional association, trade union, cartel, or even a secret society.
So basically the Masons were a guild? 
Yea they could be considered as one. Guilds depended on grants of letters patent by someone of authority to enforce the flow of trade to their self-employed members.