Suddenly started stuttering?

Suddenly started stuttering? Im 19m and just this year started getting a bit of a studder. I've always mixed up my words but now I'll basically repeat the first part of the first word in the sentence, or the first part of the last word a couple times before finishing. I used to only mix the words in my sentences (Instead "He" id say "She" or "The fox jumped over the dog" would be "The fox jumps he over the dog") I dont do drugs or drink or hit my all at all that I know of recently. Only thing I can think of is college stress but I was way more stressed last year and never developed anything