I used to love swimming but stopped going. Now I'm older I wanna swim again but don't want to stick out... How do you go about avoiding that?

I am on the larger side and haven't been swimming because 1. Swimming costumes are tighttttttt 2. I don't want to be seen as the whale and pointed at and 3. I'm very self conscious about how I look.

Is there anything that I can do to get back into swimming again without looking "different"?