Jealousy is a common emotion. Almost everyone, at some point in their lives, has experienced this feeling. Generally, jealousy by itself is not a symptom of any particular mental health disorder.
I believe that your feelings are relatively common, especially among young adults. It is human nature to want to develop close connections with others. It is likely the reason why social networking is so popular. People have a strong desire to connect with others.
You stated that you feel that people don’t want to be around you. Just because you feel that way does not mean that it is true. Don’t assume that there is something “wrong” with you. It may be that people do want to be around you but lack confidence in their own social skills. Perhaps they are shy or introverted. They may want to connect with you but don’t know what to say or how best to approach social situations.
If possible, you may want to consider joining other groups who are more active. That is a great way to meet new people. You may also want to consider joining other local community groups in an effort to meet new people. If this continues to be a problem, then you may want to consult a therapist. A therapist could objectively evaluate your interactions with others and make suggestions for how to improve your interaction style, if necessary. Please take care.