Truthfully, you're putting way too much pressure on yourself and your desire to succeed. I felt out of my league when I started university, so I took a year out, came back, and then achieved a 1st Class Degree whilst dodging many mental health hurdles. Young people shouldn't take education so seriously, it's not like you're in prison and doing the laundry-you have the opportunity to be whoever you want to be and university grades won't stop you. I think people who are tangled up in education should go and travel and have some fun because that's what life ought to be, not some miserable and worrisome trudge through the trials of the education system. The more you go and explore the more your perspective will widen, and you should realize that enjoying yourself is way more important than any panic university can give you. Besides you're 19, try getting to 30 and feeling the same way you do now. Being young is so fraught with trying to please people and yourself that you stop realizing you're a young person. Education can really be like the aforementioned prison if you let it.