Hi lovelypher, welcome to Psych Central.

When I went to orientation with my daughter to the college she was about to attend, they had the students go somewhere else and the parents sit in the auditorium. The speaker got up and told the parents that many of their children would struggle this first year and call home wanting to come home. The speaker said, "Do not let your children come home, it is so normal that they will be very uncertain and stressed and even frightened about being in college with a lot of other students they don't know. Your children are used to the intimacy of their own high school in their own towns, this is very much different and will take them time to adjust to.

I thought I would share that with you so that you know what you are feeling is actually VERY NORMAL.

Ofcourse you feel like you will fail at being an adult, thing is, that is something one develops into GRADUALLY. We gradually grow into our adulthood, and part of that is "making mistakes" too. Also slowly accepting that in the real world, there is no such thing as "perfect". You are new at college, college teaches us to learn how to learn and we do that all our lives.

We learn by "doing" so what that means is we attend a class and listen and we have homework, part of the learning is in "doing" the homework. Part of the "learning" is going to the library, looking up information, sitting and reading through it, writing things down (notes) and practicing "learning itself" also if one struggles with a subject, learning how to go to the teacher and ask for help, even look for a tutor to help one learn whatever they are trying to learn.
My daughter struggled with calculous, so she found a tutor, she was not perfect, but she slowly learned how to learn formulas and then remember them and problem solve from that. Was she perfect at it? No, but she did learn something that helped her on her "learning how to learn journey".

College exposes individuals to a new "learning" experience it is a place to "grow" and it doesn't have to be "perfect". Not everything one learns in college will actually be used in their life either. My daughter for example has a fantastic job revolving around statistics and examining these statistics and working out a certain products for huge companies. She never uses calculous, however, she learned the benefits of using "formulas" which she tapped onto using in her career and she is actually "very good" at what she does. And, when she was a freshman, she never pictured herself doing what she does now in her career, and she was far from being the adult she is now.

It takes time in learning how to learn and slowly figuring out how you can use what you learn in your life. Expecting yourself to know that now is not being reasonable with yourself.