@haleytremonttblr
You won't be able to access the online features unless your gamertag is linked with your EA account.
If you're being prompted to reset the password though, it sounds like the gamertag is already linked to an account- you'll just want to be sure you're resetting the password for the correct account. You can check if you're on the correct EA account by looking over your Connected Accounts here. If you don't see your gamertag listed there under connected accounts, it means you're on the wrong EA account.
For more help on locating the right EA account, you'd want to reach out to the live support team through the help site here, or you can get in touch through Twitter or Facebook as well if you prefer.