I’m slightly annoyed my company didn’t give me shifts because I look skinny/ young what should I do?

I worked at DHL as an agency worker I noticed the manger would always put me on the scanner scanning barcodes and never helping out with the lifting and putting the parcels into cages. I was always tiring up on time and enthusiastic with my work. My manager said there was slightly too many of us and said he would tell some people not to come in. I’m really annoyed that I didn’t get any shifts this week and it made me think because I’m female and they swapped me in with a guy instead which is not fair since they always complained and never looked happy

I’m slightly annoyed my company didn’t give me shifts because I look skinny/ young what should I do?
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