What do you really want? Fancy cars, big houses, a lot of money? These material things may bring you a short term happiness, but it will never fulfill you long term. The thing that really makes you happy often times it is something that gives you a sense of PURPOSE.
We have to know what we are here for, and what we can do to improve others' lives. The only thing that can bring meaningful to your life is when you know that you are being helpful to others people.
Do you remember the last time how much joy you had when you helped other people? That's the key. The more people you help, the more happier you experience. Therefore, find out what you are passionate about and pursue it.