You are repenting. By starting this thread, you're recognizing your brokenness, mourning over it, and striving to take up your cross. Salvation is a lifelong struggle, and many people will go to confession and confess the same sins over and over, some for years at a time before overcoming them. Others will confess some of the same sins until their dying breath. That is simply the truth of the fallen world. We struggle with our sins. Period. That struggle does not end.
You will not be "kicked out" of your parish for these things. Such thinking is nothing short of a lie from Satan himself. Our Lord is the Good Shepard that leaves the ninety-nine sheep and goes looking for the one which is lost. The Fathers teach us that the tears of repentance we shed in over our sins are our second baptism. There is nothing you can ever do, NOTHING, to get "kicked out" of the Church...the only way to leave Her is to separate yourself from Her with an unrepentant heart. You, obviously, are repenting. Speak with your priest about this, let him know your struggles. It is vital that you confront this sin with him. He will help you. As a matter of fact, he will most likely rejoice over your sincere repentance and contrition of heart. What you are struggling with is not unheard of...it is actually VERY common, especially among boys your age. It is sinful, yes, but to not despair! For such despondency will lead you only into deeper sin. Instead, stand firm in Christ, together with your priest, go boldly in confessing your sins (and be diligent about taking these things to confession once you're receiving into the Church as a communicant). The only way to keep moving after you fall down is to get back up. As one story goes, a man once asked one of a monk, "what do you do at the monastery?" The monk replied, "We fall down, then we get back up, then we fall down, then we get back up..." Remain steadfast in your faith, that is of utmost importance. To paraphrase the words of the priest to the penitent at the beginning of confession, "go boldly before our Lord and Savior, withholding nothing, that he may forgive you all of your transgressions..."
In short, we must strive to live a Christian life each day, starting over and doing our best. When we fall down, we repent and move on, not despairing over our sins but trusting in the mercy of God towards those with contrite hearts (as the Psalmist writes, "...a broken and contrite heart, thou wilt not despise").