Are ya sure?
10 Therefore, brothers, be all the more diligent to make your calling and election sure, for if you practice these qualities you will never fall.
2 Peter 1:10 (ESV)
4For we know,brothers loved by God, that he has chosen you, 5 because our gospel came to you not only in word, but also in power and in the Holy Spirit and with full conviction.
1 Thess 1:4-5 (ESV)
Sometimes Christians are criticized because we seem so sure we are going to heaven. Well, that is part of being a christian. If you are not sure, you have a weak faith.
The qualities listed in second Peter are over and above your faith. You must also have virtue, knowledge, self-control, steadfastness, godliness, brotherly affection, and love.
All of these require confidence. Confidence in the Gospel. Confidence in your faith. How can someone evangelize if they are not confident.
We are saved and should be proud of it.
17 "Let the one who boasts, boast in the Lord."
2 Cor 10:17 (ESV)