Nobody knows if they're saved. It's prideful for you to say that you're saved. Only God knows who's saved and who's not.
These are some of the comments that people will make when you express confidence in the fact that you're saved based upon your faith in Christ.
But this only shows that people are simply misguided and ignorant about the scriptures.
1st John 5-13 says,
These things have been written unto you that believe on the name of the Son of God, that ye may know that ye have eternal life,
and that ye may believe on the name of the Son of God.
God wants us to know beyond a shadow of a doubt that we have eternal life based upon our faith in Christ.
And in fact, He equates salvation with becoming a child of God.
John 1-12 says,
But as many as received Him, to them give you power to become the sons of God, even unto them that believe on His name.
Romans 8-16 says that the Spirit bears witness with our spirit that we are the children of God.
God wants us to have confidence that we're saved.
And it's not pretentious to claim that you're saved when you're basing it off of clear scriptures.
What's pretentious is when you claim to be saved based upon your deeds rather than the finished work of Christ on the cross.