Hey, thank you so much for finding the strength to share this. You deserve so much more than to be casually belittled by family, it is very wrong and most likely due to many toxic behaviours projected onto them, so please don't let it consume you. It is hard in our day and age to not be constantly faced with hyper-idealised models, influencers and even what an ideal female body should look like in daily life. It often leads to unhealthy comparative, ruminative thoughts and deteriorates confidence and self-esteem. No matter how much weight you gain or lose, your inherent true worth is who you are inside and the right man will see this In you and value you no matter what size or ethnicity you are.
I believe self-frustration and scrutinising others despite not wanting to is a subconscious process to work through, and is often solved through complete self-acceptance in how you present, and knowing it ultimately doesn't matter. Maybe it may help by shifting the criticality of thoughts to ones of appreciation for how other women dress while separating yourself from the equation. This may help to alleviate the pressures your family is placing on you which is now affecting your outlook on others and yourself.
Maybe this is a time, in your 20's, to focus more on self-love and growth within of who you inherently are- your values, dreams , goals, passions, spirituality, and inner-fullfillment. You don't have to rush to lose weight, there is no timeframe for anything, maybe it is good to not focus on the superficials now.
Remember, your 20's are not lost, this is only a difficult chapter apart of your amazing story. Your body will never define how much beauty and love you can truly experience in life. A beautiful body will never bring true fulfilment. I am so proud of your strength, you are very admirable. keep the faith.