You may often find it difficult to get into a group, so you tend not to mix and you avoid people. You prefer to be 'invisible'. Even feeling this way, you may envy people who seem to be getting it right easily.
You may often search for faults with yourself or even silently blame others for this feeling. When someone asks or expects you to do something, you find it difficult to refuse - you just do it to get it over with or perhaps sometimes to please them so that you can fit in.