I believe some people just have better social skills or are able to send good "vibes" to other people whether they realize it or not!...... Some people value good-looking people, others funny people, others smart people, others kind people, others social people and so on. I'd suggest to just find your people ang go on with it! It's ok not to be popular with certain people. Not everyone is going to like everyone else. That doesn't mean that there's ANYTHING wrong with you, it just means that those people you're seeing value other factors probably. I hope that person that didn't got invited didn't get hurt too much! Just be near him/her and provide support if you can. Sometimes surrounding ourselves with the people who are the closest to us can be VERY rewarding and much more meaningful than going to parties and such. :