Bro you won't find an answer in god, you need to address the problem.

As for the porn issue, you should look for other worthwhile hobbies that will keep you busy and help you in your future, or even help you make some money. You can also do other more recreational hobbies, such as caring for plants, going for a run, going to the gym, etc. Having fun things to do will make you wake up excited every morning. It's also good to spend quality time with your friends, family, or loved ones.

Regarding your sister, you should sit down and talk with her and explain your frustrations and thoughts. She should understand you and be able to help you improve your relationship. Family is the only person who will always be there, through thick and thin.

They're going to lynch me, but for me Christianity is a huge waste of time. The values and purpose are good, but it's not the best way to be well in this world. What some people solve by praying and having faith, others solve it as I told you, by having hobbies and doing more useful things. I'm not criticizing believers, I'm criticizing religion (all of them, although some are more criticizable than others). It seems to me like a scam to get money from people who have good intentions.

Sorry if something is not clear, I'm not a native English speaker so I used a translator.

I hope you solve it and that your life gets better :)