1humblesheep, please don't get discouraged. Other than one of my children, I don't know that I've ever led anyone to Christ. We can't know for sure if someone is saved or not, we don't save anyone. We just point the way to the One who does.
I believe that God will orchestrate encounters where we have the opportunity to witness the Gospel. Just keep studying His word, pray, and be ready to give an account of that hope that is within you.
Sometimes just walking out our faith is what we need to do, God will bless that and use it for His Glory. Being a Godly spouse or parent, friend or co-worker will cause those seeking Him to take notice and it may be what God wants to use, so be ready to share the Gospel when the opportunity arises. We aren't called as individuals to witness to the whole world alone but rather as a part of a body, joined a fitted together, with Christ as the head. We're all in this together and every one of us has a role to play. Like Kliska said above, you may have already helped point the way to Jesus with your posts to someone reading.
I do understand how you feel and how you worry about reaching the unsaved. God is very much in control and as you continue to seek and make yourself available to Him, He will use you at the perfect place and in His perfect timing to share the Good News.
edit: If I could type faster I wouldn't always be repeating the good advise others have given, lol.
1 CORINTHIANS 1:18 For the preaching of the cross is to them that perish foolishness; but unto us which are saved it is the power of God.
ROMANS 1:16-17 For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believeth; to the Jew first, and also to the Greek.
For therein is the righteousness of God revealed from faith to faith: as it is written, The just shall live by faith.