How can I get over being called so ugly all my life that no one would marry me?

Everyone could use some improvement in how they look, and could achieve it. Take inventory on what needs "fixing" and what you might wish to do about it. You may also wish to try a little counseling, since this self image you have seems embedded with long standing. Good wishes, most of us , and probably you included, fall within the "average range".  

If you're not pretty enough, then are 

you thinking he proposed with some 

ulterior motive? Does he know of your 

inferiority complex? It's VERY important 

both of you know and understand what 

makes each of you tick, what is going on 

in each others heads, if you want to have 

any chance for the marriage to succeed. 

TALK to him about it and figure things out 

together (and maybe also consider getting 

counseling, because it's not usually a thing 

you just get over on your own one day). 

well stop being ugly then , get surgery on your face, stop being fat, if u cant take care of your hair, dont bother growing it, fix those bushy eyebrows, look at your blackheads, etc.