Try to stay positive in your essays and let the real you shine.
To hide your profile, select "No" for the option "Other members can see when I'm online? Keep in mind, however, that members who are most active on the site keep their profile visible in all places because it ups their chances of connecting with people.
Try to put your best foot forward with at least one photo and snappy, detailed essays about your interests.
The photo is key since most people feel more comfortable writing to members they can see.
And you never know, someone special may be looking for you and never get to find you if your profile is hidden.