No, God's plans are never about making someone feel lonely, useless, or anything that would cause someone pain.
I'm sorry you are feeling this way and unfortunately, I can't say that I've been in a similar situation. However, I do know that you are neither useless or alone like the enemy is trying to make you feel. The enemy is spoon feeding you these lies so you'll question the worth of your life. They're nothing but absolute poison. Don't let the enemy have this type of advantage over you. Jesus possesses the ultimate power that can help you during this time in your life. He thinks you're worth a lot. After all, He died for you!
Kitty, I'm not sure if you have or have been, but commit your life to God. Spend time with Him in prayer. Talk to Him. Read the Bible. Obey His word. God has time for you, why not make some time for Him?
Hope everything gets better for you!