Hi, I'm going to try to make this short.
Basically I need another Christian to talk to about this issue.
Nobody else seems to understand me.
I'm a 19 year old male, and I am a virgin. Abstinence is a huge deal to me and always has been. I've always been hoping that my future wife would be a virgin as well. I've recently met a girl at church and I really, really like her. She's so sweet and loves God very much. But she's 22 and I'm not sure if she's a virgin. We've been talking a lot and seeing each other outside of church but it's still a mystery to me. She wears a purity ring but didn't say if she was still a virgin she just said it's her promise to God to practice abstinence. I don't know a polite way to ask, but it's really bugging me. I don't want to fall for her and find out she's not a virgin because it would make it really difficult for me to have a serious relationship with her.
I've tried to talk to friends about this but nobody gets why it is so important to me, one friend called me a "sexist pig" for feeling this way. Is it wrong? What can I do? What should I do? I can't just change the way I feel about purity and everything. I don't want to be with someone who didn't wait for me, but at the same time I've already developed feelings for her and I can't make myself stop seeing her if she wasn't.
No, it's not wrong. It's not wrong to base your marriage wishes on pretty much anything that's legal. In your case, it's not even sexist - you are holding yourself to the same standard. (There are some non-virgin men who demand their wife be a virgin and those guys are sexist - because they're putting different expectations on women than themselves.)
But it is on you to make it clear that you don't want to be in a serious relationship with someone who isn't a virgin. Don't ask her about her sexual status early - say what your expectations are early. Maybe she's a virgin, but doesn't want to be with someone who would discount non-virgins. It's your deal-breaker, so you need to use your words and tell her about it.
And if you find out she's not a virgin and you get angry or upset because she didn't save herself for you back when she made a decision (or had a decision made for her) before she even knew you existed - that is wrong. It's wrong to consider the state of her virginity the only important thing about her, or a valid indicator of the type of person that she is, or the thing that determines her worth. You may decide you don't want to have a relationship with her, but that doesn't make her a s**t, a harlot, or any of the other names that get thrown at women.
If you do want to have a relationship (with anyone), talking about your sexual history is a very important thing to do, for both of you. You're a virgin - your ideas around sex aren't going to be shaped by actual experience, and that's something in itself: you're going to do a lot of learning in your sexual encounters, even if those are in marriage, and your partner might not wish to take that on. You might discover that technically the woman you're interested in isn't a virgin because she was sexually assaulted as a child or an adult. As someone upthread said - that kind of thing can take a lot of time, even within a loving marriage, to move past. You might find that actually, this person isn't a virgin because they decided to have sex, and even enjoyed it - but that she had safe sex, and has had things like STI tests, and knows that her decisions have had no lasting physical consequences.
So, in sum: You're not wrong to have this as a dealbreaker - but you have to lay it on the table as something you want, not ask her and then get upset because she doesn't meet your requirements. And talking about sex and sexual history is important for any serious relationship and more people need to do it.