@crazythat He's 100% jealous and threatened. From what you've said here you're going to make an excellent lifter. Your putting up amazing numbers, with minimal training. I know women who are over 220lbs who cant lift that.
People try and find the thing that will get under your skin when they're trying to tear you down. Being female, the weight element almost always works on us.
But turn it around - it's true you've had a natural advantage being bigger, you're used to moving more weight day to day. But don't apologise for it - none of the small, light kids are apologising for their natural advantages in athletics! This boy has a natural advantage that he produces more testosterone, he's just not trained hard enough to capitalise on it. That's a him problem.
And...being bigger as a lifter is not a bad thing. Go look up female power lifting. Watch Tamara Walcott, she's a
beast. She's amazing. You can be like her if you train. You don't have to try to be thin if you don't want to. You can be empowered and awesome and the weight that you are.
Keep lifting, sister! Ignore the haters!