I’m tired of the "just change your mindset" BS. How do you actually manifest big stuff when you’re overwhelmed and hating life? Please help.

I need help with manifestation and I’m struggling with that shit. I don't know what kind of method to use because there's so many methods and I get overwhelmed with the bunch of shit I see out there on social media. I'm not lazy, but I want to manifest so many things at once and it’s a lot.

For example, I have this big dream to get into a pretty difficult top school for a very specific major. It’s a very prestigious school. I also want to get into rowing as a sport, but I have a disadvantage because I’m 5'3" and I’m stuck on that (that’s why I want to manifest to grow height) I’m trying to improve my GPA and do a bunch of stuff, but I don't know how the fuck I'm gonna have to do it.
My issue is with my own head, the frustration and the overwhelm. And I already fucking know that, so please don’t tell me "you need to change your mindset." I’m aware of that. I just don't know how the fuck to actually do it when the advice out there is so unhelpful.

I want very specific things and I don’t know where to start or which things to want first because I want all of them. I’m currently in community college juggling a bunch of stuff. I need to take the SAT (never done it) and I need to manifest a good score. I need to manifest a good GPA for this final semester, I have two finals left and I need to kill them because my GPA is killing me right now. I want to manifest getting into this school and getting into a specific program for my extracurriculars.
How the fuck do you guys manifest so many big things at once? How do people actually do this? I’m tired. I feel like manifestation is real, but I don't know how the fuck to do it. I’m really hating my life the way it is right now and I just want to make it.

Please help mee
My dms are open