I can hold convo but not initiate it. How to improve? Please

I have crippling social anxiety to the point I can only give one word answers to parents and live in my room all day. I want to go for walks or learn a hobby or make a friend but I’m too shy so I stay in my room all day. Despite this, i somehow a couple years back made myself enrol in uni. Im currently studying and have my own room on campus. I’ve also eventually taught myself to walk to the local Woolworths and shop for groceries each week (they have a kiosk I use). Once, the kiosk didn’t work and automatically notified a worker. I had no problems talking (or more like answering). They spoke to me and asked what I was getting and I answered and felt no anxiety from it. Same goes if a tutor or lecturer talks to me in class, I can answer and activate my voice. I feel like I’m half way there u just need to learn initiation. Like while answering what groceries I was getting, there’s no way I could’ve made myself ASK a question like ‘does this happen a lot’ or ‘how’s work been’. I want to have this ability. So much doors will be opened and I can finally progress my confidence if I just learned to speak without questions or be the one to start a convo. I think ultimately I’m like If I had problems with the communal microwave, there’s no way I’d be able to ask someone else in the kitchen if they know how to work it. But if they walked up to me and asked what I’m studying I’d be able to easily go ‘blah blah this and that :)’ not literally those words tho……. Anyway sorry this is a bit of a rant I just want to improve and maybe finally have a friend