Are Attachment Styles Permanent?

[mpc]

In case you need to read up on attachment styles, go here: http://www.helpguide.org/mental/eqa_attachment_bond.htm

 

Reading the info here, I'd categorize myself as "ambivalent." Is there any way to "beat" this and become "secure?" Or am I forever doomed to being clingy, needy, erratic, etc.