If you click the "Trouble Signing In" (PSN Users) or the "Forgot my password" (XBL) option on the login screen, you get the option to reset your password.
Follow the instructions and you will recover your account.
Hope this helps <3
[spoiler]Moderator edit: This thread has been moved to the #Help forum where you can find answers and troubleshoot any Destiny in-game/bungie.net/companion app issues, courtesy of other helpful players and Mentors.
Feel free to private message the moderator who moved your post, link to topic, for further clarification about why this topic was moved.[/spoiler]
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Thanks.