All of us who have bought and sold baseball cards over a long period of time have made mistakes like this. I've overvalued plenty of things and have taken losses on them.
Tom gave the best advice: readdress this collection after you are no longer emotional about it. Now would be a terrible time to sell it because you are not able to look at it objectively. If you are angry at yourself for doing this you are going to compound the problem by making poor decisions selling it. Wait some period of time, sell it for the best price you can, and just accept the loss. And no reason to sell your whole collection over it since you say your finances are still fine.
Just step away from it for the time being. This doesn't sound as bad to me as it does to you. If you bought a stock and it went down you wouldn't beat yourself up over it. It just happens.
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