Confused by balance

Coinbase rep verified that my $1,100,000 balance is correct (1.3b ZINU coins) but when I try and swap to eth $500,000 in ZINU only converts to like $20 of eth and the gas fee is $5,000. Coinbase rep said essentially I’m rich on paper but not really. Does this make any sense? According to CMC ZINU is currently $0.00079 which converts to the proper $1.1m but it’s not really worth that when converted to another currency to sell. This all doesn’t make sense to me because I don’t care enough about crypto to have done a lot of research on how it all works. Just bought shitcoins with extra cash on a blind whim years ago. How do I stop seeing $1.1m every time I log into my wallet because it’s rather depressing.