The most important thing I can tell you is that you are not useless -- not in God's eyes. He cares about you and knows all about your situation, and He wants to help you. You can trust His promise: "Never will I leave you; never will I forsake you" (Hebrews 13:5).
What steps should you take? First, thank God for His love for you -- and respond to His love by committing your life to Jesus Christ. Right now, you may wonder if God even cares about you, but He does, and the proof is that He sent His Son into the world to purchase your salvation. When we give our lives to Christ, God welcomes us into His family and makes us His children forever. Why not make your decision for Christ today?
Then commit your future to God, and ask Him to lead you as you seek employment. Be open to whatever He has for you -- even retraining for another job, if that's possible. Don't be a defeatist, but see your age and your experience as potential assets. Wise employers know that older workers often are the most dependable and responsible.
In the meantime, ask God to fill your days with useful activities. Can your church or other agencies in your community use you as a volunteer? Does your church have a Bible study for people your age? God has said, "I know the plans I have for you... plans to give you hope and a future" (Jeremiah 29:11).