When no-one's talking to you, don't feel ignored, look at your phone and smile.
When you misfit in a group, do more of listening than talking, nod to what people say and make them comfortable.
Don't think that everyone's watching you; you are not that important.
Never forget, your clothes, physique, looks, accessories and makeup are not your identity, your emotions, your goals, your deeds make you. Don't be conscious.
More you highlight or glorify your personality using artificial sources, more likely people will notice your flaws.
Comparisons make you feel inferior, unworthy and less. Are you a designer cloth kept in a showroom? Who asked you to compare yourself with others?
If people are rich, do they pay your bills? If people are attractive, do they solve your any purpose? Why bother?
Learn the art of laughing at yourself if people make fun of you, arguing or explaining will make you the centre of attraction.
What else?
Next Steps
consult Psychiatrist/ Psychologist