ENFPathetic enough. This might also be the reason why you were/are depressed. I know for sure I would be if I didn't have a goal to strive for. Sometimes this goal was pretty much the only thing keeping me going. Imagine the perfect life, go deeper into that feeling of creating an impact, delve into your innermost desire to do good, what do you see? how do you see yourself accomplishing it? Is there anybody you know that tries to do the same? No? Good, you've got a hell of a task laid before you. Yes? great, you've got a new role model.
Pursue what is meaningful, attempt to do the highest good and pave a road towards it. make a plan without putting in any specifics, just lay out milestones. It could be the completion of certain studies, the attainment of a job position or making a positive influence for a certain amount of people for a certain number of times, whatever it is, strive towards these goals for the sake of coming closer to your end goal. This is a great measurement of success you could use during your entire life, and if you follow up on your dream of meaning, you'll be proud at the time of looking back at your life.