Correct me if I'm wrong but are you not supposed to get my fingerprint from the encrypted message that I already sent you?
Hopefully this time works and I want to test later on how to decrypt it if I am successful in encrypting message. It was worth a try.
Your messages are one-way communication and are also unsigned. I can read the messages you sent me, but I can't see your fingerprints. So, if you want to practice decrypting messages, other people need to have your public key to send you encrypted messages.
You can also practice decrypting messages that you encrypt yourself.