I still like how you express yourself, that's highly readable writing, thanks.
My spider sense tingles when you say your 5 year younger brother is doing better than you. Well mate that's probably because he has a particularly articulate older brother! Yep YOU. It's a known and accepted bit of educational knowledge that often enough, being able to talk with older siblings helps people be more social, and smarter and more successful.
You may recall the story of Geoff Hunt Aussie Squash world champion, well he was the younger brother and learnt lots from his older brother who wasn't as "good" at squash after a particular point in time.
Front counter work at Maccy's is probably pretty challenging and stressful, I reckon friday and saturday's rush hours be very busy. Breathe, breathe, one task at a time, concentrate on that task, get it done, don't take customers insults personally, forgive work mates for they are stressed like you, speak up about small things stressing you or that need improvement. Stay on one task at a time. repeat, have a break! done job mate!
Happiness is achieved after satisfying work and play and spending time with family friends and oneself.
good luck, dng.