Since your wallet does not contain the private to your address, it probably is not the correct one. Do you still have an intact (and untouched) wallet file (backup?) anywhere?
Or do you only have 1 file which you move around all the time ?

If you can't find the correct .dat because you have overwritten it, you might try using a recovery software to restore it (but make sure to backup all of your relevant files before doing this).




This is an address. And a wallet manages your public-/private- keys and displays your addresses.
Regarding your privacy, it is a bad habit to use the same address on multiple online services/exchanges. You are basically giving away your whole privacy.
A better approach would be to use a new address each time you receive coins to your wallet.