No exchange is one-way only.  The teacher is taught.  The healer is healed.  The lover is loved, even if the reciprocation is not readily apparent.  All interactions inform an ever-evolving system of growth.  Think in terms of service.  As you serve those around you with whatever is your gift, be it a lesson or a healing or a gentle smile, what goes around flows around, and the whole is enhanced.  Serve on.  It is not selfish to receive, so give your heart freely.