Why am I stuttering so much lately?

Why am I stuttering so much lately? So lately, I’ve (20M) been stammering a lot, way more than I usually do, to the point where I end up freezing mid-conversation or whenever I try to start one and it makes talking to people way harder than it has to be. Now, I’ve had this problem since I was in junior high, but it was only an occasional stammer that would pop up mid-conversation. My late father and some of my friends have suggested that this is probably due to nervousness but I used to be able to converse with anyone with ease and now I freeze and stammer 80% of the time. Do y’all have an idea why this is so?