Welcome! You are certainly on the right track as far as learning more about the Catholic faith and participating in the sacraments.
I am assuming that you are asking about masturbation and whether it should be confessed. The answer is yes, it is objectively a serious sin. However, if you were not aware of that, your culpability is greatly lessened. Go back to confession and tell the priest that you were not aware that it was sinful. The problem will be solved!