Changing style

Anyone have a hard time with their wardrobe? Ive been somewhat of a tomboy all my life and now im 31 with 3 kids. I look at other women with how they dress and I just feel out of place. Everyone just seems all put together and I feel frumpy when I wear my clothes. I don’t take full body pictures at all. Ive looked on sites like boohoo,fashion nova, plt and its like I can’t picture myself wearing clothes like that casually. I don’t go out so its no reason to dress sexy so I end up wearing jeans and a t-shirt. I do buy alot of different color jeans from fashion nova but it seems like all their shirt are cropped and it makes me uncomfortable. I see plus sized women all the time wearing it and they look good idk whats wrong with me.