There are a number of attachment styles that people adopt. Anxious, Avoidant, Secure, Dismissive. These are the four major styles, You can look up the details on Google.
Attachment injuries come from mostly from family of origin issues.
How do you know you have an attachment issue, your relationships are not working, you feel invisible, you are not getting your needs met, you are allowing others to sabotage and abuse you somehow.
This is heavy stuff so I want to share an expert Attachment Trauma, relationship coach and Psychotherapist Alan Robarge, Here’s a video explaining this issue.
Hope you find it healing.