Men can be very insensitive with the things they say and how they behave around women. Our society puts a great deal of stress on women to measure up to this ideal image of a woman. The image the media and Hollywood project is false - like smoke and mirrors. There are all kinds of tricks used by celebrities to enhance, alter and change how they look. When you see pictures of these women in everyday clothing, hair pulled back, most of them look like you and me - regular women. There is nothing wrong with that. Natural beauty really exudes from the inside outwards.
Your boyfriend may not be aware of how that makes you feel. My husband was insensitive early in our relationship. I told him how it made me feel inadequate. That was all it took. He didn't do the "guy thing" around me. Guys may look at women and comment and that may be their nature, however, they do not need to do it in the presence of their girlfriends. Let him know this is not ok with you and you would like him to abstain from doing that when he is with you. If he cares about you and how you feel this will not be a problem for him.
Go to the mirror as you get yourself ready in the morning. Tell yourself, outloud,
"I am beautiful, I am sexy, I am wonderful, I am ME". You will be surprised in just a few days how that will change how YOU feel but others will see you in that way. It does work. Just keep saying it over and over. The transformation from within will occur and others will see it on the outside. You are a women and virtue of your female form, YOU ARE BEAUTIFUL. Believe it and the world will see it.