No one here can diagnosis you from a post. What people are telling you are there are many red flags in your post and it sounds like you could use some professional support.
Untreated depression in young people can lead to poor performance or misbehavior in school, anxiety, anger issues, risky behaviors, chronic stomachaches or other health issues, eating disorders or substance abuse. (source: https://health.usnews.com/health-care/patient-advice/articles/2017-04-21/what-are-the-risks-of-untreated-depression).
As pointed out in post #7, other medical conditions can cause similar symptoms.
I am not seeing a lot of personal responsibility/accountability in your post. It’s not your profs jobs to make sure you understand. It’s your job. If you are struggling in a course, you need to go to study sessions, TA/Prof office hours, and tutoring. If your work groups aren’t going well, pull in extra help.
What have YOU done to get involve in your college community to meet other students/make friends?
You wont be handed a job, even an entry level one. Many students have to send out dozens and dozens of resumes to get a job.
Have you ever been diagnosed with ADHD/ADD? (I ask because you said you are having trouble concentrating).
You are just a freshman. No freshman are prepared for a career yet.
How many courses did you take this semester? What is your GPA? Reducing your course load next semester might be a good idea if it doesn’t impact your financial aid.
Again, go talk to some one in your school’s health center. Start there!