There's an old saying that goes something like "Don't focus on how big your problems are, focus instead on how big your God is." On a certain level, that's way too simple, even trite. But without discounting the real pain you might be experiencing in a moment of crisis, I encourage you to embrace that sentiment. You can't forget about the problem, but you can change your focus, and decide to cling to the goodness of the Lord.
YouTube Hank Green “Study Hall.” It talks about navigating the mess of college and career choices, like choosing a major (and what a major is!) What interests align with which majors, etc.
Porn: I wish I could keep you away from it entirely but at least I will prepare you.
It’s normal to be curious, etc. but like anything else, it can get to be too much and can be very harmful, especially to a very young person. It can disrupt your healthy sexuality, ruin your relationships and even your career (no porn at work!)
Also keep in mind it is a business designed to make money, not to be realistic. That's not the way sex looks. Also the women are NOT enjoying themselves.
So try to avoid it, but at least keep it to a minimum!
You can’t be a good parent if you’re a miserable person. Take care of yourself. Make the changes necessary to get in a good place. Ask for help. The happier you are, the happier they will be.