Is it normal to feel angry when you have failed and are ignored??

Hi i am a fun loving person but the people around me i dont understand them they are only good to people who are successful. I feel bad when i am good in something they are good with me, when they are in their bad times they remember me, but when they are in their good times they only remember the people who are successful in any means.. I feel bad. For Example now my cousin is getting married he always used to remember me when in trouble of any kind and now he's getting married and has not even cared to invite me people around me think i must have received the invitation but i haven't. many other people like this socially or professionally or whatever. is it normal or is there any problem in me or should i not be a good person and be there when somebody needs me