Seems like you need a pep talk. I dealt with a stutter through college and it wasn’t as bad as we think it is. Every speaking assignment that I felt like I couldn’t do it in person I asked my professor to do it just in front of them and they were very accommodating. As far as not attending lectures I would seek out your university’s mental health clinic and see what’s causing you to not have the motivation to go. I only had one project where I had to go up and speak and it was with four other classmates. Doing that actually helped my stutter and proved that I could accomplish anything with or without my stutter. We’ll except maybe customer service but I don’t have that kind of patience anyway lol.