lla this is normal, although its knackering. And it really does get easier. Between 12 and 16 weeks was an almost magical time for me, where DS suddenly started sleeping better, settling better, feeding more effectively and less often. There is a light at the end of the tunnel, its just beyond reach right now for you maybe, but it is there.
Remember there is no guarantee that formula would help your DS sleep better - if he is hungry, he will still wake, regardless of how he is feeding.
Also, it might interest you to know that EBFing mums actually get 45 minutes extra sleep at night, because the hormones produced during the night feeds allow us to stay almost semi-asleep, and drop off easier after we're finished too.
I know this is a really difficult point, but it does pass, and when it does it really is such a relief!
Do not let your family pressure you into something you don't want to do. If you decide for whatever reason that you want to stop / reduce breastfeeding then that is different. But don't just stop because your family think you should.
Big un-MN hug - it does get easier very soon. x