Definitely share some pics!
Keep your head up, I know how frustrating it can be but I promise it gets better as you go.
Everything is an experiment when you're a new grower, I can tell you how I set my ventilation, lights, what nutes, soil, etc but there's variables to everyone's environment that are going to be different and it just takes some time and patience.
It's important to remember, when you change something in your environment that you won't see results immediately, you need to give the plant a couple of days before you see if the change helped.
I've had plants with barely no green left and just about dead that I was able to bring back and still have a decent harvest.
Share more about your setup such as ventilation, light settings, temp, humidity, etc.
Show us pictures of your complete setup and maybe with the help of members here, we can figure out what's going on.
Don't think of issues as failures, they're actually teaching and training you to become a better grower. None of us would be where we are today without making mistakes and learning from them.
Please don't give up, it really is a rewarding hobby!