not sure what to do

i've been doing jujitsu for about 3 years and brazilian jujitsu for 1 1/2 year and i'm a grey belt and yellow belt and i mean i've done 7 tournaments and my first year or my first 4 i was a beast like i just only got gold on gold i was great like i was smashing higher ranks it was peak but i was also homeschooled and i tried very hard every practice i was in love with the sport so much but when i went back to regular school i've been losing my tournaments but that's also when i got promoted before i went back to real school because i was smashing as a white belt but ever since i got my grey i've been getting bronze in my division or no medal at all and losing by 10-20 points and i'm not sure what to do i still go as much as i used to i just don't love the sport anymore and recently i got snubbed by the red at my tournament when i should've won and i know it shouldn't matter and i should just get over it because i know i really won but i just cant i miss how good i used to be and how much i loved the sport i just don't anymore i don't like it and wanna quit but i can't please someone tell me if anything similar has happened to them because maybe it's just a phase? but im not sure please help