How to handle attention?

I was bullied a lot when I was younger from 11-14 years old for my looks, and I thought I was ugly. I used to avoid mirrors. I’ve grown up believing I'm ugly.  However, now that I am older I have grown into my looks. Now I am struggling to come to terms that I am getting looked at and attention for my looks. Every time I get a compliment I mistrust the compliment. I still get embarrassed and doubt the compliments. I know that beauty is in the eye of the beholder, and it is often felt within. I am not going to post an image of myself on here, so do not ask.

TLDR: How do I handle attention without coming across as a narcissistic?  

Edit: 21F