'@username' for the administrator account - Is this a security problem?

Hi,
I don't know if i'm being a moron here or just over paranoid but I am concerned about security ie: being hacked.

In my WP/BP setup I am the administrator and I have locked out ALL other users from the admin panel by role. However, my '@username' is displayed publicly within my BP profile along with my display name.

Now if someone wished to hack my site then they are halfway there by having my login username (ie: my @username)?

Should I be concerned about this? What steps can I take to make my setup very secure?

Is there anything I can put in my htaccess to prevent a breach under my @username. Or any other steps to make my site secure?

Many Thanks In Advance :slight_smile: