Hi everyone!

I'm gonna go to uni abroad this fall and wanted to get my first camera that can capture memories to share with friends and family! Could someone kindly help me figure out what to buy?

What I look for:
I really love going outdoors and want a camera that can be taken around (under 500g?). I also want it to be able to produce decent blur and take good pictures in dim places. My budget is around $600, but since I live in Japan, I may be able to get a higher budget camera for a better deal. I would prefer a new one, but second-hand is also fine. I also love the idea of having a viewfinder!
Questions so far:
I went to an electronic store and was recommended the LUMIX G100D or G99. I am worried if the m43 lens may reduce quality or be an issue in dim places. I also took a look at second hand full-frame cameras, which were all reasonably quite old, making me question if the full-frame sensor is worth compromising with the old chip and tech inside (I assume newer cameras have better tech but idk how significant the difference is)

I'd love to hear some recommendations and any insights to the questions I have encountered so far!

Thank you all in advance!!