The call to Single life isn't a call to live in a vacuum, unconnected to other people. Single people, to find fullness of life, MUST live in relationship to other people - or they'll become very lonely, stunted personalities. Single life is a call to be able to share one's gifts and talents with other people - in the local parish, neighbourhood, workplace, and the wider community.
Happy, fulfilled single people are those who are generous with the gifts and resources, and live in relationship with lots of other people - who help them to discover and develop their gifts, and develop to their fullest potential.
Many single people have assured me that the single life is a great lifestyle.