Anxiety disorders are greatly misunderstood by those who have never experienced the overwhelming, very real emotion brought on by anxiety. It is not something you can just “get over” or stop somehow in the moment. It will take time and work on your part to improve or, hopefully, recover from this debilitating condition. Medications designed to calm anxious feelings are quite helpful in the beginning treatment of any anxiety disorder. Not knowing just what event precipitated your social anxiety makes it impossible for me to suggest anything specific; however, effective anxiety medications in conjunction with talk therapy and, depending on the source of your anxiety, the technique of Flooding can be very effective in managing and, perhaps, eliminating this from your life. Other things to incorporate are relaxation techniques and meditation. The calmness that accompanies deep breathing and meditative relaxation can be quite effective in reducing anxiety. Once you have some tools to work with to address the issues of your difficulty, the anxiety will lessen over time.
Just remember in regard to your social interactions, no one is truly liked by everyone. In fact, there are some folks out there that you don't really want to like you, if you are honest with yourself. Obsessing over negatives will only attract negatives, setting yourself up for failure. Try to find small successes. If you encounter rejection, be gracious and move on. Avoid overcrowded social situations, as that only invites a greater percentage of rejection, especially if you are experiencing anxiety in this setting. Anxiety looks crazy to outsiders. People will reject the crazy part. That does not mean the "real" you is being rejected. Anxious behavior paints a broad negative stroke on your social interactions. So, get the anxious behavior under control before you attempt to interact socially. Once you find calmness in your demeanor, then you will encounter more positive experiences.