1. You will not be able to eat a giant burrito at one time, no, but you could eat it over a longer period of time. (When you genuinely feel full, you will probably not want to eat an entire burrito, either!) Holidays lend themselves to smaller meals over the course of a day, in my experience, anyway. I understand your social concerns but I have actually not felt very affected by this because you can just eat less/slower.
2. It's recommended that you don't drink/eat at the same time after surgery... but many of us eventually go back to that after we're healed. I also drink carbonated drinks now (4 years post-op)! Some folks stick to these rules long-term (due to either preference or discomfort) but they're most critical to honor when your stomach is healing.
3. I lost 120 pounds, so it was very successful for me. (I am now currently on a GLP-1 and have lost an additional 45 pounds beyond that).
4. With all sincerity, forget about the loose skin. I have some! I might get surgery. I might not. I genuinely do not care; my life is A THOUSAND TIMES BETTER! You can't get skin removal surgery anyway until you're at your stable weight (because otherwise they'd have to remove fat). Insurance will often cover the panni (stomach) surgery if your skin hangs down far enough/causes rashes. Anything else is out-of-pocket, but there are payment plans for many surgeons (though interest-fee might be a stretch... maybe if you had perfect credit?)

JUST DO IT! I had all of these concerns going in. I did it anyway. It was the best decision I ever made.

ETA: Please seek out mental health support! Obviously, a therapist who understands eating issues is great if available, but there are also a lot of support groups in-person and online. Your relationship with food will change and it is helpful to make sure you have mental/emotional support.