Is a hybrid bike my answer?

Hi all! I’m new to biking and honestly don’t know much. I currently have an old cheapo bike from target I got over 15 years ago in middle school. it was great but it has so many issues and am looking to upgrade. I’m mostly using it on our local walking/bike paths (so a mix of paved road, sidewalk and something very smooth pavers and pretty flat). I also have some issues with rounded shoulders so I’m looking at a more upright seating position. I’m just a casual rider trying to find alternative ways to get some exercise in and be outdoors. I’m also 5ft1 and 180lbs. Anyone have advice on what type of bike I should look for? I don’t want to spend a lot either, preferably under 300 but willing to do more if it’s worth it.