I have the worst self esteem to a crippling degree, what's normal and what isn't?

I am a female in college. I have an incredible long term boyfriend and there are times he is not allowed to look at me. I catch him looking at me and just spiral out of control that he must be judging my skin, split ends, pores, anything.

In well lit restaurants I feel like I could die. i don't wear my hair up because it's like a security blanket, having it pulled back makes me feel so exposed and hideous.

I use my logic to deduce that I do not look like Sloth but there are some times when I can't talk myself out of it. How much of this is normal? Are there any other girls who are consumed by this to the point of insanity?

(I know this can sound so trivial, I hope it doesn't come off as twatty. I know there are bigger things in this world than my self esteem. Thanks so much.)