36 Pounds sounds like alot of weight, but dont give up. My wife is 5'4 (on good days when she stands up really tall with high heels on a few books) and weighs 90 pounds. She used to dive with 28 pounds I think as a beginning diver so she was also tired after the swim from shore. If you are going do do a shore dive to demonstrate your skills, rest on the surface until you are ready to descend, no one should rush you. All you have to do is float.
You might also try stripping some weight off that weight belt.
You might also try stripping some weight off that weight belt.