Hi guys, happy new year!

I'm glad to have made it to 2021, but unfortunately some of my 2020 issues made it too. For starters, I've grown dependent on basically every close person to me: my parents, my boyfriend and my (very, very few) friends. I hate the thought of being by myself a lot and I get major anxiety just thinking about it. For example, tomorrow I'm supposed to go to my uni apartment (in which I've only spent 1 month, tops) in order to clean it out (I left in a hurry one month ago and it's probably incredibly messy), but the thought of having to also spend the night there alone is killing me. I didn't use to be like this, but since 2020 forced me to be around my family pretty much all the time I've sort of forgot of how to deal with things on my own and just exist on my own, really. I know it's safe and everything, I'm just super scared of being there alone. I should probably mention that I'm 18.

Does anyone else have this problem? How can I calm myself down and not have extreme worry everytime I have to go/do somewhere/something on my own? Even going shopping has become incredibly hard for me, and this irrational fear of going anywhere or doing anything alone is really messing up my mind and making me think I'll actually never be a fully functioning adult. Some advice, please? I'm pretty desperate. :(