I’d say your clutch is saying goodbye. Giving the year it is a self adjusting clutch. I would try there. If you are having difficulty selecting gears than it is definitely the clutch. If you decide to replace it check the flywheel as well.
It is difficult to say for sure I would need to hear and see it for myself but I’m in Europe and you are probably in the US. Maybe someone else can give you their opinion but from what you describe I’d say it has something to do with the clutch.