Life is full of meaning if we are meaningful to someone. In other words we have meaning if someone has given it to us.
So to find a meaning to your life, you can choose to give it meaning. You can do this by choosing to believe a worldview in which you are meaningful to someone who has the power to give us meaning. The one who has power to do that would be the one who has created us for a purpose.
If we choose to follow Christianity, then the purpose God has given us, specifically to love our God and love others, is therefore our meaning.