Sounds like you didn't store it in a wallet (directly), you left it with the exchange.
Your concerns are valid, but bottom line unless you have it in a personal wallet you don't really own anything other than a promise from the exchange.
Can I ask which exchange you used?
I'm on the wallet MyMonero. I had to login to my wallet but this time I scrolled down and the transactions showed up. The correct amount is now on my wallet. Just like I suspected, I have a 4 USD digit amount.
I signed up for a couple more brokers today and I hope by the end of next month I figure out how to unlock my KeepKey. I have my eye on coins I can't get from Coinbase like Monero and ADA. I'll post up the issues I'm running into and hopefully can get some help. Keepkey's customer support sucks.
I honestly feel like a million bucks even though I'm not where I want to be in life. Just a couple more years and it will still be more challenges as I go higher and higher.