Not sure whether I'm the one bloke mentioned or not but as I've weighed in previously I'll take a stab at answering.
There's lots of ways of determining class but if you want a starting point, think metric or imperial as an analogy, you could use Marx's definition
or one based on income and social status.
Under Marx's method I'm working class; I've always lived on a wage.
On the other method as a retired mid ranking Civil Servant, homeowner etc I'm middle class.
I'd suggest you might be the same. Working (or worked for a wage) but with a professional qualification and appropriate salary you might be Middle Class using that type of measure.
TBH unless/until class equates to privilege (and I take @theclaud's point about boomer's) it's an interesting discussion but not one that gets us all that far.