Every once in a while a kid loves to go out alone - to be one with God in his heart, to explore the garden of eden God has offered to all. Some kids can play for hours all alone without ever being lonely. Lonely is who ever has his heart closed. As soon as your heart is fully open you always feel the presence of someone comforting you and being with you. A guardian angel or just God's omnipresence can take away the feeling of loneliness.
To open your heart is something you have to do all on your own. The switch is in your mind. Your desire to love all, to forgive all, to be loved by all is the key to open your heart.