How to be more beautiful. UPDATE

I've never been a beautiful girl. I have no chin or jawline. I dont have desired features, and I only recently figured out how to deal with my overwhelmingly thick hair. I can do very basic makeup (my go to is a winged liner and red lip), and I'd like to say I'm okay in fashion. I dress vintage-ish and since I've started dressing like this I have been complimented more than ever because how I dress seems to camouflage how plain I am.

I'm not morbidly obese but I am technically obese even though I look somewhat straight sized (210 pounds and 5'10" and like size 16/18). This seems to be a stagnant weight and healthy enough (I have autoimmune diseases and I asked my doctor about my weight and he says because of my composition it looks fine especially since it is steady and that losing weight to fast could be detrimental to my condition). So I could slowly lose weight but if I risk my health I cant work, which is important to keep up.

(This is an EXTREMELY casual look for me but shows you my general body shape)

I'm just.... extremely plain. I don't mind being plain for me. I actually like the way I look. I just know that I'm a bit plainer rather than being gorgeous or sexy, which is fine with me.

But I feel like I'm too ugly for my husband. I feel like I'm so ugly and plain and I want to actually be beautiful for him. Hes such a wonderful and kind man, he deserves a beautiful wife. He tells me all the time how beautiful I am, but I dont know how he can possibly feel that way. I'm usually a pretty objective person and truth is. I'm just not very beautiful, so I dont see how he can possibly think that I am. We've been together 8 years, married for 4 and I just know I wasnt his first choice. He dated some other gals while I pined after him. I dont doubt his love but I know he fell in love with my personality and not my looks (original post mixed this up sorry). It was a friendship that became more (from his perspective) and not first sight attraction (like it was for me). I don't know what else to do... I feel like I've done everything I can to try to feign being beautiful but it just doesnt feel like enough.

Maybe I need more pretty underwear? Pajamas? Those are the only 2 places where I dont make sure it's pretty. Do yall have any tips?

UPDATE: aw ladies. Thank you for your being so kind. I do realize that my figure isnt the worst. I'm actually somewhat okay with it, I could always lose some... but most of us have something wed love to lose. I cant really give a good picture because I want to be anonymous but I'm sure if you met me in person, in common clothes like leggings and a tshirt and my face and everything in view... tall would agree I'm not much to shake a leg at.

But I did decide to get some fancy pajamas. Hopefully that helps me feel a little better about my less dressy times. I went somewhat simple so the contrast wouldn't make me look stupid.