If you are a Christian believer, seriously believing in Jesus Christ, believing that through his crucifixion and resurrection, if you confess your sins to Him and repent of your sin, that Jesus will and has forgiven you. You are saved, for all time.
The only way for you to then lose your salvation is if you denounce Christ, and blaspheme against God's Holiness and His Holy Spirit, thus accepting Satan.
In MARK: 3: 28-29 Jesus states:
Verily I say unto you, All sins shall be forgiven unto the sons of men, and blasphemies,wherewith soever they shall blaspheme: But he that shall blastpheme against the Holy Ghost, hath never forgiveness, but is in danger of eternal damnation:
This is the only sin that is unforgivable by Jesus.