First, I would like to compliment you on your honesty. You are experiencing what many young men, in truth, what most young men experience in their early life. You’re 15 years old. Your body is starting to reach sexual maturity. That means that not only are your eyes noticing girl, but your body is noticing girls as well. It’s normal. How you react to it is up to you. Channeled correctly, this is even a good thing. Masturbation is not good though. It’s not a real sexual experience and you don’t respect yourself when you do it.
For starters, I’m not going to tell you to say 15 Hail Marys a day. That’s daunting and not very practical for a healthy active and preoccupied young male. Just ask your Holy Mother to intercede for you in your day to day life. As per the nudity, you’re now maturing and you are naturally curious. Stop looking. It will only make things worse. Easy? No! When do the temptations go away? Never, or only after you are dead and in the ground for 45 minutes. Don’t worry, it gets better with time.
My advice: Respect women. Women after all are awesome. They are very different from men thank God. These naked women you see, they were someone’s child once, held when they were little babies, grew up like you somewhere in some part of the world and now someone is making a boat load of money by exploiting their bodies. And remember, they are not getting anything out of this deal except having complete strangers gawk at their naked bodies. Just look at it this way, would you want strange men of all ages looking at your sisters body, or your best female friends body, or that girl maybe you have a huge crush on? I’m guessing probably not.
As for the language, cool it. It doesn’t impress women and believe it or not, doesn’t impress anyone else either. It’s just a bad habit. Try to break it as soon as you can.
Lastly, do you have a Bible and copy of the Catechism, not the book you might have seen in religious instruction classes, but THE Catechism? If not, get copy of each. An Ignatius Bible is good and won’t set you back moneywise and doesn’t read like the 15th century. Start reading, even if it doesn’t light you up immediately. Your faith will deepen with time and experience. Pray in the morning and pray in the evening. Make it part oif your life. Just talk to God and tell him like it is. You’re 15, the world is pulling you in different and wrong directions and you want his graces to help you deal with these things. God will listen.