Im scared to wear a two-piece swimsuit

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I (16F) am scared to wear this type of swimsuit because I have a little bit of a chubby belly. I wouldn't say I look pretty chubby, but my stomach has always been my n°1 insecurity. Even tho I have chubby tighs, I don't even care about them. I mainly focus on my belly. For example, I used to suck it in when I was walking outside, and now it has become a habit. Also, my tummy rolls when I sit down make me insecure.

This year I saw a beautiful two-piece swimsuit and I really wanted to buy it but I was way too anxious to. I started to accept my body a little bit more during this school year, but I wasn't sure I was ready. And now I'm thinking more and more about buying it. But I went to the beach, and I was pretty envious of those skinny girls wearing bikinis. They look super pretty, and I'm scared I'll just look like a potato.

I'm trying to convince myself, I watch Spenser Barbosa's videos a lot for example. I really really want to accept my tummy. I really do, but I can't help but feel anxious when I picture myself walking on the beach with my tummy showing.

Idk if you guys can give me some advice it would help me :/