The path of relationships is not easy. It is impossible to walk through life without your heart being hurt in some way, shape or form. God has given us emotions because we needed to feel. Feeling lonely is not a sign that you are weak, but rather, that you are human. And that you have a capacity to love. Honestly, loneliness and the desire for marriage is also a sign that God has not called you to lifelong singleness. I was always very grateful to remember that God does not torment His children, and if He had given me the desire for marriage (as He has for the majority of people), then He will provide a husband. God will fulfill the desires that are in your heart.
