If you used the default options for key creation, it is typically only be around 2,800 characters.
I would suggest going to your keyring, right-click the key, and select "Copy Public Key".
Then paste that into a program like notepad++
Notepad++ will show you the number of characters contained in the key. If it really is 4,000+ chars, you may want to generate a new key using the default options.
Feel free to let me know if that does not make sense. I'll be happy to continue assisting.