Write this Scripture out in full. On the Lord Jesus Christ. It is possible you may have doubts from time to time. Your salvation is based upon what God has said- not upon how you think or feel. Thus it is important for you to read and study the Bible.
Thanksgiving is evidence of faith.
The pastor will gladly introduce you to the church. Many of them have experienced the same doubts you may have. Sometimes a full assurance does not come until God sees we mean business for Him. Remember, Your peace and assurance is based upon believing God's promises, and not on your feelings. A gift taken back by the giver is no gift.