I find it hard to deal with past relationships my wife has had. I want to...

I find it hard to deal with past relationships my wife has had. I want to know about her past, and I ask her about past boyfriends and flings, but when I actually hear about them, I feel like I'm not really special to her. Although she says I'm the best thing that ever happened to her, how should I handle these feelings?

What you should do is, not ask. If you don't want to know, or can't deal with the truth --- do NOT ask.

The past is in the past. She doesn't concern herself with your past --- so get over it.