but whoever rejects the Son will not see life, for God’s wrath remains on them. John 3:36b NIV
Why is the wrath of God upon some? It is because they are filled with sin. Sin cannot be in the presence of God. Wrath rests upon those who choose to remain living in their sin. God offers us salvation through His Son, but we must choose to accept the gift offered unto us. God will not force it upon us.
When you sin, return to Christ with a remorseful heart. Repent and submit to Him. Do not allow the wrath of God to remain upon you.