What is the best cheap lens for street photography on the Canon R50 because I have a big trip coming up in two weeks and I'm totally lost?

So I just bought the R50 because I wanted to take better pictures than my iPhone but I realized the lens it came with is kind of weird and I don't really know how to use it for like taking pictures of people and buildings and stuff on the street. I'm going to New York City for the first time in 14 days and I really want to get those cool blurry background shots but every time I try with the kit lens everything just looks flat and boring and I dont know if I'm doing it wrong or if it's the lens. I feel like I'm doing something wrong but I've watched like ten videos and they all use different words that I don't understand like aperture and crop factor and honestly my head is spinning and I feel so stupid.

I've been looking online and people keep talking about nifty fifties and 35mm and prime lenses but honestly it all sounds like a different language to me and I'm getting really stressed out because I don't want to waste money on something that won't fit or won't work for what I want. My budget is super tight right now after buying the camera so I can probably only spend like $200 or $300 max and that's really pushing it since I still have to pay for my hotel and food while I'm there.

Is there a lens that's really small? I want to be able to walk around all day without my neck hurting and I don't want to look like a giant tourist even though I totally am one lol. Also do I need an adapter thing? I saw someone mention that on a YouTube video and now I'm worried I'll buy a lens and it wont even click onto my camera and I'll be stuck in NYC with no way to take pictures. Sorry if these are really basic questions I just feel like I'm drowning in all the technical stuff and I just want to take pretty photos of the city streets and maybe some candid shots of my friends...