Here's my story of stuttering. Why is it so weird?

Here's my story of stuttering. Why is it so weird? I started stuttering when I was a kid, but it wasn't even bad. I just fumbled on some words, probably difficult words, mainly hard K-sounds. First, I want to let you know that my stuttering in most of my teenage was non-existence before. Like 1/10. I could do presentations & introduce myself without even fumbling once! It remained same for several years, into the age of 16 atleast. Then in 2013, I changed schools. Before, I was in the same school since 2005, so 7 years. Last class in my old school was tough experience for me. I was emotionally drained. (Not because of stuttering, some other reasons) The moment I changed school, I turned into a hard-core stutterer. I came to know about it at day 1 itself. Because we had to introduce ourselves to every subject's teacher, in front of everyone. For the first time in my life, I stuttered so hard. I couldn't say my name properly. I got 50+ eyes looking weirdly at me, some even smirking. I was embarrassed to hell. Then it was the same story for every single introduction or either presentation, I had to do since that day. It's been more than 7 years. Can someone explain me what the hell happened in 2013 for me? In 2012, I was doing presentations & introductions effortlessly, then in 2013, .... finding ways to run from them. My stuttering was 1/10 in 2012, from 2013, it's 8/10. Fml. I got so concious of my stutter that I even stutter in my dreams.