I would say probably not since God is the final judge or I might become an Apostate. What do you think?
You seem to be referring to two topics, the Doctrine of Assurance concerning present salvation and the Doctrine of whats often referred to as Perseverance of the Saints (conditional or unconditional future security). I will just respond to the first.
Yes there is. The Bible presents at least 3 ways to be sure of your salvation.
1-
Through Direct revelation. That is, God Almighty directly communicating the truth of your salvation to you(Romans 8:16; I John 2:20, 27; 4:13). I have experienced this and do experience it. God has, does, and can directly communicate truth. Immature Christians must learn to discern between impressions of the flesh, from the Enemy, and those from the Holy Spirit.
One can include in this category
feelings. We all want to feel like we are saved. I believe that although not all persons experience extraordinary conversion experiences with powerful feelings, at some point all those who love Christ and are saved will experience good feelings associated with true salvation. This is the normal experience.
2-
By and through God's Word. God is not a man that He should lie. Salvation is yours for the asking. If you repent
(Acts 3:19) and rely on the Christ's atoning work on the Cross for the remissions of your sins, your instantly passed from death to life (John 3:16). God's Word is true and authoritative. Therefore you can choose not to rely on feelings and choose rather to trust in what you know to be true as revealed to you in God's Word. You have access to his instruction and commands.
We are saved by grace through faith--not through feelings. If feelings are telling you you are not saved when in fact God's Word says you are, then you can choose to believe God's Word instead. Feelings can accurately reflect reality, but sometimes they do not. We must learn to discern between feelings of the flesh, from the Enemy, and those resulting from the moving of the Holy Spirit. The Word of God serves as a guide in helping us to discern between impressions from God and impressions from elsewhere.
3-
By your Conscience (Acts 24:16; 1 Timothy 1:19) That is, do you believe that you are doing what God wants you to do? If your conscience is bothering you, then that might be an indication that you are actually walking outside the will of God. But it must be remembered that one's conscience can sometimes not accurately reflect reality. That is, the Christian believes he/she is failing in regards to sin when in fact the failure lies in not having a good understanding of the work and person Jesus Christ.
There is good teaching material out there on the The Doctrine of Assurance. Ask the Lord to lead you to the right material and give you understanding.