Meditation may appear to be a solitary pursuit even when it is performed in groups. However, far from being an isolating or self-centered activity, meditation brings expansion and connection to others. Meditation inescapably brings the world into your heart. Meditators have always known this.
We live upon one world and breathe one air, yet we consciously divide all that we have into "mine" and "not mine". We are convinced by the illusion of separation. We are steadfastly wedded to territorial principles. Global consciousness, on the other hand, unites where we choose to divide, connects where we choose to isolate and unifies where we choose to fragment.
Mystics through the ages have recorded the personal experience of unity and affirmed the wholeness of all creation. Such individuals were not informed by global communication or holistic philosophy. Yet testaments of mystical experience from all traditions and times tell us what we have only recently come to know, that Life is a Unity which takes on the appearance of a myriad of forms.
So don't ever worry that your meditative practice is selfish. It will only bring you more and more into an appreciative compassion toward others.