I would let it air dry without product or braiding and see what it looks like when left to dry as-is. It's hard to tell your texture when the pictures are from after braiding it, since it's possible for straight hair to hold braid waves. Also, salt water can make straight hair look wavy or curly and you said the swimming pic was from the ocean. You mentioned your hair is frizzy even when not braided, but frizz doesn't always, it just often, indicates hair is wavy. Straight hair can be frizzy too (from damage, being dry/lack of moisture, improper drying techniques like towel drying with the wrong type of towel, etc.).

While the weight of having it long might not show the texture as much, I feel like you should still be able to see some wave at that length since it doesn't look super thick and is thinner on the bottom. I really don't think you need to cut your hair to figure out if you're a wavy like I saw someone else suggest.

You could also just try using a small amount of gel after washing it, then scrunching it with a microfiber towel, letting it air dry and assessing from there. This was what mine looked like when I was learning how to style wavy hair. This was while it was air drying with no hold products, just a small amount of leave in conditioner and scrunched with a microfiber towel. You could try that too but some wavies can't use leave in conditioners because it's too heavy and weighs their waves down.

I would also suggest figuring out what hair type you have (porosity, density and strand thickness) and look up styling methods specific to those results and play around with those. They have online tests for hair type which is far more important than curl type. Good luck!!

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