In wild life (plants, wild animals, micro-organisms, etc.) everything aims for reproducing, doesn't it. Growing up to maturity, eating, fighting for territory, mating, whatever it takes to produce offspring. That's the goal of everything.
Just now I started off with a long philosophical evaluation of why man exists. Then I deleted it. The religious aspect and the evolutionary aspect. But, I don't think that is what you are looking for. You already know all that stuff. I don't believe that reproducing is the ultimate goal to life. I believe that we exist to support other life. I know it is an incredibly vague statement, but I believe our meaning is vague. It is so different for each of us. I believe we exist for each other. To support, anger, heal, love, and nurture. Sometimes, through disease or something else, a person turns evil and loses his ability to have a purposeful life. Who knows, maybe it is that persons purpose to be evil. I hope not. I just hope they are "broken" in some way.
Remember, everything you do (even at home, by yourself) affects other life. You don't have to have children to do that. So, if anyone is putting pressure on you to have children, just ignore them! Children are not why we exist! At this time you are part of a group that helps people with their money. The money they have is used to support their life so they can be doctors, teachers, sewage workers, etc... So, what is your purpose in life at this time? Well, you help heal, you help teach, you help other life in general. I would say your life has incredible meaning and importance! If you change jobs or even retire, you continue to help others, although sometimes indirectly. Even a hermit effects others in many ways. We exist to be part of this biomass on earth. Whether it is Gods plan or just nature the results are the same. Even your presences here on this forum has influenced affected all of us!
I hope what I have said makes since to you. Existence is a personal thing that affects the rest of the world.