Do I lose my salvation every time I sin?
No! We are sinful beings, but through Christ we can lesson our propensity to sin. If that were the case, then you would essentially be earning your salvation by your good works. Ephesians 2:8-9 explains it this way, "For it is by grace you have been saved, through faith and this is not from yourselves, it is the gift of God not by works, so that no one can boast."
If you could be good enough to deserve salvation, then you would boast in yourself, not in Christ. Furthermore, if you could live without sin, Jesus would not have had to die. If you have truly repented of your sins and asked Jesus to be your Savior and Lord in your life, then you have begun a lifelong journey. When you fall into sin the Holy Spirit will convict you. This does not mean that you are not saved; it means that the Holy Spirit is calling you into righteous living through conviction of sin. This process will continue until the day you stand before Jesus. Philippians 1:3-7 says:
"I thank my God upon every remembrance of you, always in every prayer of mine making request for you all with joy, for your fellowship in the gospel from the first day until now, being confident of this very thing, that He who has begun a good work in you will complete it until the day of Jesus Christ; just as it is right for me to think this of you all, because I have you in my heart, inasmuch as both in my chains and in the defense and confirmation of the gospel, you all are partakers with me of grace.