We are all born into this world by natural birth as unregenerate sinners, and were by nature, the children of wrath, even as others, But God, which is rich in mercy, for his great love, wherewith he loved us, EVEN WHEN WE WERE DEAD IN SINS, hath quickened us together with Christ.(Eph 2)
Eph 2:8-9 - For we are saved by (God's sovereign) grace, through Christ's faithfulness in going to the cross (Gal 2:16), and that NOT OF OURSELVES, it is the gift of God. Not of works, lest any man should boast. Spiritually dead people (unregenerate) cannot accept a spiritual gift, from a spiritual God, that they think is foolishness (1 Cor 2:14). and will not come just as they are.
The quickening of God (being born again) comes as a gentle breeze, you do not realize where it came from, nor where it goes. As for myself, I do not know when I was born again, but I have the assurance that I was.
A lot of God's children think that their conversion was their new birth, which may be your case.
Christ died for those that come to Jesus, and they are those that his Father gave to him (John 6:37-40). and Jesus said that he would not lose any of them, but would raise them up at the last day.
God's sheep are his elect. John 10:26-29 - But ye believe not, because ye are not of my sheep, as I said unto you, my sheep hear my voice, and I know them, and they follow me, and I give unto them eternal life, and they shall never perish, neither shall any man pluck them out of my Father's hand. My Father, which gave them me, is greater than all, and no man is able to pluck them out of my Father's hand.
Calvinism isn't true.