I don’t have all the answers so I hope I don’t come across like that, but I struggle in a somewhat similar way to you. I am a Christ follower and in the Bible it calls us to evangelize to non-believers around us. I took this too far to the point where nearly every person I saw I thought I had to speak to and save and bring to Christ and when I wouldn’t do that, I would believe that I was personally sending that person to hell because I wasn’t confident enough to talk to them. That’s not exactly your problem but I still think I might be able to offer some help. At the end of the day neither you nor I can save a single soul. Only God can do that. All we can do is represent Him well to those in our lives. Sometimes that will involve walking up to a stranger on the street and saying that God loves them, sometimes it will be answering a Bible question a friend has. Sometimes it’s just being a listening ear to someone in need. There is no one way to represent Christ other than just being available for God to use you. Don’t worry about what you will say or do, if you are trying to honor God, God will help you and in ways you cannot even imagine. And unfortunately there will be those who will leave you, who will reject you and to that I would say this: Matthew 5:10-12 (NIV): "Blessed are those who are persecuted because of righteousness, for theirs is the kingdom of heaven." So if your heart is to help those around you to come to Christ, that is awesome and amazing, but know that you can only represent Christ and show His love to those around you. Through that Jesus can touch their hearts and help them to come to know Him personally. If they don’t accept Him, well that’s between them and God. Some plant seeds, some water, but only God can bring the increase. And in those situations where maybe God wanted you to talk to someone and you didn’t, just ask for forgiveness and pray that God would bring someone else along to help them. God isn’t going to condemn you for making a mistake, if you were perfect, than you wouldn’t need Jesus, but you aren’t perfect, I’m definitely not perfect, none of us are, that is why He died for each and everyone one of us, and no one comes to the Father except through Jesus Christ, the King of Kings and Lord of Lords, the one true perfect Lamb. I don’t know your name or who you are, but God does. He sees you and knows you, He’s sees your heart, let Him in to calm your heart and mind. Trust Him and His perfect plan. That is MUCH easier said than done, and I am not good at just trusting God, but God will help you with that too. That last thing I’ll say is this, if you are having trouble with intrusive thought or OCD episodes, just ask God to bind those thoughts and He’ll help you through that. I’ll be praying for you
