Many times the reason we are jealous is not because of other people luck but rather because we don't live up to our full potential. Try to focus on things you can control and to improve yourself, put on some muscle, dress nicely, do some cheap activities you enjoy, whether it is some specific hobby or if you don't have one do stuff anyways just for the sake of increasing your social interactions.
Those things will improve your situation regarding all the things you don't have to buy, like attracting the opposite sex or having fun experiences. By doing all those things you will also increase your "luck surface", you will hear about opportunities earlier, you will be more energetic and pro active and eventually something will fall into your lap. Even if not, you will enjoy your life and will not care so much about other people success on the financial front.