Is it normal to ask my gf about her relationship history

Wow that sucks, women always tell about their relationship history by themselves, you don't even have to ask. In fact younger they are the more they will talk about it.

She could be hiding something nasty...

She's hiding something, because whenever my bf asks my history, I always tell him. I smell something fishy.

Why do you care?

I would suggest you go watch "Clerks".... Cos sometimes if you nag a girl about her history she just might tell you the truth and say that she's only slept with 3 people, but gave blow jobs to 37 men and you're #37.

my boyfriend knows a little bit about my past relationships, (we hung out in a group, people talk), He's a little jealous sometimes, but we work though it :)

Just leave it alone

If she doesn't want to tell you, then that's her choice--leave her alone.

It's not likely she's hiding anything, but more likely that she has talked about it in the past and it didn't go over well (it rarely does).

You should ask yourself why it's so important for you to know; you might just be letting your insecurities run wild. If you are concerned about STDs, then you could BOTH take a test to rule it out, but DON'T ask her to take it unless you're willing to submit yourself to the same test.

Good luck. You have a lot to learn.

I know tons of girls who don't tell. I didn't until two years into my relationship when I found it relevant.
I was in two horrible relationships, so I wanted to avoid him acting nice if I told him beforehand. By not telling him, I saw his true colours, then told him my past.

It's normal yeah,but sometimes ignorance is bliss,if you hear something that you don't like it'll no doubt eat away at you and it could end up messing up your relationship,something that I learned from experience

Depends how serious you are.
If you're really young, then I'd think it's fine (you won't have much of a history/much to hide), same with a mature, very serious relationship (trust-earning).
For your everyday highschool things, I'd pass. Who cares? We probably regret things, and what good will it do knowing she's dated four guys on your football team for s month each?