I'm slacking again.....and reasons why

As I am in my dorm room, I realized that I finally am doing work ahead of time so I will be prepared. This semester, I have been slacking and it is taking a toll on my grades. I believe the reason I am slacking is because I give up too easily and do not believe in myself or push myself to do better. I was doing good at keeping myself in my books at the first beginning of this year. What I did not understand was that no matter how much I kept my head in my books, I usually froze up on tests and forget everything. I was stressing myself out and I did worse on my tests. I was still trying, hoping that I make a good grade until I made a miserable grade on my algebra test. It took my grade from a B to failure. After that, I gave up hope and, pretty much, just made whatever on my tests. Plus, while letting myself slip, I was depending more on guys to make me feel better but that was short lived. With all this happening, my mind was tired and stressed and I was on the verge of giving up. I been missing classes and not giving a care about them because I thought that I could not do good with any class, which made me depressed. But this Saturday, it was different. With all this going on, I just laid out and stayed in my room the whole day, taking a break and freeing my mind from all this worrying. I feel even better since I went to church today also. I just needed a church in me since I have not been going like I should lol. Now, I feel better and believe I can make it. I probably will not have the grades I want. I just do not want to fail another class. I will try to make it to all my classes on time from now on and do better for the summer and help my GPA.