What should I (28M) do ?

Hi, I (28M) never had a proper relationship in the past. I met this person (24F) online over almost a year ago and we are talking daily ever since and we do flirt quite a lot .

She is very fun person to talk to and I can be myself around her. I'm not good looking have tried dating apps with no success. She is not beautiful either but now she said she likes me with marriage in mind for future.

We met only once and couldn't meet again since I had to move to a different country a while back.

TL;DR should I say yes to her even though I don't find her beautiful? I have never been approached before and every time I approached a girl in the past I got rejected. I fear if I don't say yes to her I might end up alone.