Solitude and loneliness are not the same thing. Loneliness is the sign that something is lacking. The purpose of solitude is to bring us home to the center of ourselves with such serenity that we could lose everything and, in the end, lose nothing of the fullness of life at all. When you are alone, are you lonely or are in solitude? If loneliness is what it's about, what you may need most is the cultivation of the richness of solitude.
There are no limits on true self-giving. It is not just to those one likes that one makes the offering. This involves a love that issues from the very CENTER of the person's being, directed to the CENTER of the other person's being, a love that gives ALL that the person is in order to foster the other person's life, a love that is offered to EVERYONE, without exception and without condition. The love is not offered to people because they are one's friends; people become "friends" because one loves them.