TIMETRAVELLER. My stand on being in a relationship is: it should make you happy, guilt-free happy.
What is there for you or your BF to be guilty about? Nothing.
It is just unfortunate that his family has a lotta pretentious crap.
But should that matter? Where you are now -- no,
See, you are still both studying, and should SAFELY enjoy your youth and love.
You are not dependent on that family, and you don't need to interact with them.
Really, you can take it or leave it -- that family and their pretentious.
Now, yes -- his family crappy. -- but you should not take it against him & deprive both of yourselves this good relationship.
Just go with the flow between you 2,; and avoid his family. If you can't Deadmahin mo. Step away from their collective petty minds.
Do not criticize them, though they deserve criticism plus more -- because your BF will get hurt. Family is family, even if they're oink-oinks.
There is also no need to go into "me against your family" mode since the time is not appropriate for that yet. Buti na lang!
So, just focus on doing your best with your studies & motivating each other. Live out your love, that's part of your youth. BUT hwag ka pasasabit ha! If you make that error -- you will very much narrow down your options.
Just let your love for each other develop. If it matures and becomes stronger -- you will both find a way to handle his crappy family and relatives. (I suggest you 2 live abroad -- far away & do not bring over to live with you anyone from his side).
However, if this love should fizzle out, then it was not meant to last, really. Do not despair -- you can always do better.

You are young, enjoy life. Stay away from people who will spoil your day.