Am I not attractive?

In the last 2 years I’ve gained a lot of weight . My sisters who were overweight have lost the fat and looks very beautiful and whenever a conversation focuses on my eldest sisters says that I’m the prettiest of all the sisters . My rest of the family also says that I have the best features but it’s very clear who’s the most gorgeous so why do they keep telling me that I’m beautiful because I know where I stand . It’s like they’re trying to reassure me and pity me because I’m not good looking . My elder sister I think makes stuff up like saying " my husband’s friend saw you and was asking about you " or " somebody brought a proposal for you " but I don’t believe her like no way it’s true . My other cousin sister is my age but she’s so damn gorgeous like really really pretty with fox eyes, full lips , light brown eyes , dark thick brows and she’s super tall like a model and so fit as well . She’s very soft spoken and girly and I’m the opposite of that . I never like to compare us both because she’s my bestfriend and I love her but it’s true we cannot be compared . I’m not saying all this because I have low self esteem and I am insecure but because I’m self aware. I have a lot of potential but I’m just not harnessing it . I’m just trying to understand why my family keeps giving me fake reassurance. Is it because they think I would feel bad? Because if they like that that’s just more hurtful