If the password you enter for your account is incorrect, it will say so at the login screen. Just above the password box it will say in red letters "Invalid password, please try again". Is this the case?
To be able to recover from this, you have to recall your password. No, I'm not being funny
From the GRUB boot menu (hold shift during boot if you have not enabled it by default) select "Recovery mode", which will allow you to select to enter a root console. However, to do so, you need to know the initial password of the user you created during the installation of Linux Mint. If for some reason you changed your initial password for your user after
installation, you may be able to login to the root console with your original password and there run the command:
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where you replace username with your username. You can then set a new password for your user. Warning:
do not do this if you have an encrypted home folder, as this will not work with encrypted home folders.
The other possibility is that you have installed some software or configured something, only on your user account (i.e., not on the guest account), which is somehow crashing your session so you get kicked back to the login screen. In that case, try to choose a different session to run for your user. Do so from the little gearwheel icon in the top right of the login box. For example choose MATE if you normally run GNOME, or vice versa. If that works, you can try to fix what you did before or failing that just create a new user to start with a clean slate.