Co-worker didn't invite me to wedding but invited others from work?

Anonymous
A girl worked with got married and didn't invite me to her evening reception but invited others from work. We'd hung out a few times outside of work with another co-worker and had fun, getting drunk and gossiping. I hadn't had much time to talk to her of late, as work's been very busy but I'd chat to her during coffee breaks. I knew she was getting married soon and asked questions about the wedding, showing an interest. She left work a couple of months ago. I went to her leaving lunch and we were chatting as normal and I thought perhaps no-one from work was invited to the wedding. I commented on one of her FB posts asking how she was doing and she never replied, but she replied to another co-worker's comment above mine. I wondered if I'd done something to offend her although she liked one of my photos I put on FB recently. Then I found out that a lot of people from work were going to the wedding. Some of them I knew she hung around with as they went to lunch together but others I've never seen her speaking to before. So it's making me feel like I must be a horrible person that she'd invite them and not me. I know a lot of this comes down to numbers and so on but it's strange seeing pics of people I'd never seen her hang out with at her wedding. I find it hard to approach people in social situations. I'd thought this girl could have been a 'proper' friend, as she'd reached out and asked if I wanted to go out for drinks, when other people don't bother. In my company there's lots of close friendships, even some romantic relationships. But I suck at making friends. I am wondering if it's just ME. If there's something about me that drives people away. A few years ago another co-worker got married and she invited nearly everyone in the office (about 15 people) apart from me, and another girl who'd only been there a few weeks. I remember a couple of the guys asking me about it and having to tell them I'd not been invited; awkward. It's like being back at high school.
Co-worker didn't invite me to wedding but invited others from work?
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