Is this a stutter, or something else?

Is this a stutter, or something else? I used to stutter a lot when I was younger, maybe 11 to 13. It went away gradually pretty much and I didn't have a problem for a while. About three years ago, when I was probably 16 I started noticing that when I got nervous, mostly when speaking to teachers or other students, I wouldn't be able to get words out, not even sounds. I would just stand there like an idiot lol. But after a while it started happening even when speaking with close friends and family. Sometimes It's fine and I can speak without issues, but other times it takes me 10 seconds to compose my thoughts and get my thoughts out. Is this a stutter or something that can be helped?