I have been there especially off and on lately,but as a Christian I am not alone for I know I have a Savior my Lord Jesus if you are a Christian I encourage you to read the book of psalms in the bible or Job for that matter they both had times when they felt alone but God showed his love and compassion as well as forgiveness and they became two of the greatest people in the Bible outside of Christ of course.
If your not saved I would encourage you to read the book of Romans verses like 3:!0, 3:23, 5:8 and many others in times when Satan makes me doubt my Salvation Romans is always the first book I turn to and also John3:16 and 17
Welcome to this forum