I dont feel attractive

In the least conceited way possible:
I always have random people come up to me and tell me all the time how beautiful I am. People also always tell my husband that he did a great job when he introduces me to them. But honestly, when I look in the mirror, sometimes I think to myself: what do they see? I do not find myself ugly, I just dont see that "beauty" other people notice. I think I come off more confident to other people then I  actually am. But deep down I have alot of insecurities! Does anyone else struggle with this?