I can understand that this is shocking.
You will survive. The way you write my impression is you'll do fine, eventually. Never give up, aspire to follow https://en.wikipedia.org/wiki/Desiderata and it will work out.
The delivery method via gift-wrapping sounds, hmm, emotionally sub-optimal to me. Is your mom otherwise emotionally peculiar?
Moving out is an opportunity.
Sharing a flat or whatever is a good idea. I've done it for more than ten years (or all my life, if you count family as "shared living"), and would not want to miss it. It's economical and with the right flatmates can be plain fun. Also, when it works, it can stabilize you in many ways, emotional, economical, intellectual, health etc.
(In German and other languages, there is a word for this, Wohngemeinschaft, loosely translated as "accommodation community". The point is that this word refers to the people, the tenants, whereas "shared flat" and "shared house" refer to the accommodation. And, in contrast to the latter two, Wohngemeinschaft is not specific with respect to the type of accommodation.)
If possible, take your time in choosing one. On the one hand, if something is weird, that may be a red flag. On the other hand, what may seem weird to you may just be healthy human variation. Gaining experience in this sense will help you with many things in life.
For these and other reasons, be prepared to occasionally move to a different shared accommodation.
Yes, the economical side may be difficult.
Don't be ashamed to accept help from others.
But of course be cautious. There are people who are just waiting to exploit people in your situation. Best if you have a trusted friend or two who can help you judge.
In the end chalk it up to experience.
Optional, once you are on stable footing:
Learn about "non-violent communication" (net-search it).
Use it to diplomatically tell your mom how you feel about this.