To put it bluntly,
You'll be loved (loved) even if you're not cute, and your sense of jealousy, which is the source of your trouble, should fade little by little. Please don't worry.
I think it's a very natural part of the mind to be jealous of the cuteness of a child much younger than yourself, or to feel like you're not loved (don't stay here) unless they're cute. There's nothing unique about it.
I think you're really blessed to be born so cute that you think you're a “cute person.” Even if you don't want to make them cuter than necessary, they are naturally “cute = lovable.”
Surely, childhood memories (accumulation of) of being said to be cute and cute may make you do that, but if you put something on it, measure something called “cuteness,” and compare it more than necessary, wasn't it because you had anxiety in your heart that “you can't be loved unless you're cute (don't stay here)”.
However, if you think about it carefully, there is no standard for measuring cuteness, etc., that is originally determined by this, and there are ten people, ten colors, and there are a lot of differences. (Of course, there are generally common values (standards) depending on the era, region, and ethnicity, but if you unravel them one by one, they are extremely individual subjectivity, and there are also subtle differences there.)
This means that what one person thinks is cute, another person doesn't think so, and only I feel that something that others don't think is cute (adorable). That kind of thing is quite natural, isn't it?
Once such unmistakable “facts” come to light within yourself, you should stop worrying too much about the cuteness of yourself or others.
Of course, if that happens, jealousy will naturally stop happening. Please don't force yourself (do your best) to try to lose or suppress your jealousy. If you do that, you won't be able to do anything extra.
Even if waves occur on the quiet surface of the lake, they will eventually calm down if left alone. If people try their hand to calm the waves, it won't fit in extra.
So why don't you take what you're feeling as a problem too seriously, think for yourself until the facts come to light, and deepen your own insight.
Sowaka Gassho