Please click https://www.google.com/support/accounts/bin/request.py?hl=en&contact_type=acc_reco&ara=2&ctx=acc_reco&rd=1, then click on the option No.
Then provide as much details as possible to prove that you are the owner of the Gmail account.
You will need another email address that you have access to, so that Google/Gmail can contact you. You can create a free new email account at www.live.com.
Then Google/Gmail will contact you later, usually within about 24 hours, after verifying your submitted recovery form, in order to recover your Gmail email account.
If you want to, you can create a new google/gmail account: Create an account.
Please let me know if you have any further question later. Thank you.