Resentment is a sign you are giving too much and are in need of replenishment. It’s a good example of how even the “negative” emotions are on your side, interpreting your experience in the world.
Have a yearly “review” right before school year. Raise allowance as appropriate. If they want more money, they’ll have to take on more responsibilities.
On marriage: Your spouse will change. You will change. Some for the better, some parts for the worse.
Tastes, plans, health, body shape, education, needs, beliefs... all change throughout our lives. It’s growth. (It’s also decay!)
Support each other through both.
Encourage each other to be true to yourselves. Don’t sweat the small stuff. Be kind. Pray for each other. Have fun together. Keep learning about each other. Be your partner’s biggest fan.
The thing about behavior is that if you practice you get better. That goes for good behavior and bad behavior. The more you lie, cheat, etc. the better u get. Decide What kind of behavior you want to be good at and then practice practice
Let it go. They’re going to make really stupid choices. I drank AND smoked in high school. We all go through it. They need to be able to trust you and rely on you. They’re navigating the world and they need a safe harbor. Be that safe harbor. It’s more important than fighting over stupid behavior. Let them know you don’t approve - sure, but fighting over stupid stuff is just going to make you both bitter.
“What do you think about keeping things PG-rated for a while? We’re both just figuring stuff out. The last thing I’d want to do is hurt you.” Or whatever spin you want to put on the idea that there’s no rush, and plenty of amazing sensations to experience and explore, long before things go further than kissing. Hang out in that PG range as long as possible. And if you can’t talk with your partner about that then you probably shouldn’t be having sex anyway.
“Growth is painful. Change is painful. But nothing is as painful as remaining where you no longer belong, or where you’re unable to be yourself and thrive.” Mandy Hall (paraphrased.)