Luckily, as you say, you still have two and a half years of college left so that will give you time to decide and discern what the rest of your life will look like. Personally, I don’t like telling people about big changes coming up in my life until it is certain (or as certain as it can be). TBH, this is a very relatable post because I am in my second year of university. I’m studying English, which is the least vocational subject you can get, so I really don’t know what I want to do after university, but I have certainly thought about entering the priesthood. As for your parents, pray for the courage to tell them and trust in God that it will work out well for you.
Also, I saw you posted way back about Ash Wednesday and for some reason, I actually remember reading that post for advice on my situation (not identical to yours but similar). Best wishes