Insecurities

Okay, so I was with my boyfriend today and I realised that I felt disgusting. I don't know if it was because I haven't eaten too brilliantly over the weekend but normally I feel as though I can be myself around him and he'll still love me.
I was in a terrible mood towards the end of our meeting but I just thought it was because I was tired.
This revelation triggered me to think about how much pressure teenage girls are under. I know there's a lot of coverage about it in the media and in schools, but I don't think anyone has the right to write about it unless they've been there themselves.
Obviously, I know I'm luckier than some girls. Some of them feel like this on a daily basis, not just for one afternoon, and also, I have a boyfriend to tell me that I'm beautiful, many of these girls don't have people tell them that they're beautiful and give them compliments.
It must be horrible to need reassurance for your whole life. I can't imagine how awful feeling like that for a prolonged period of time must be. I always had the mentality of "if you want to be happy, make yourself happy" but I realise that it's definitely not that easy. It took a while to put me in a better mood, and I didn't even feel that bad about how I looked.
Teenage girls get so insecure about so many things, things they don't need to worry about. From what I can gather, it's mainly about looking after their appreances to impress boys, and it's really unnecessary. I know it's all very well for me to sit here and preach about how you're all beautiful because I already have my one true love but seriously, if somebody really wants to be with you, they won't care if you get the occassional spot, or if your weight fluctuates a bit, or if your hair isn't perfect all the time, or if you don't have a full face of make up on. If they really love you, none of that matters.
I realise that it's not always about impressing other people, sometimes you just want to feel good about yourself, and I can't tell you to stop spending hours on your hair and make up because you're beautiful without it; I have no idea how it makes you feel when you're not made up. I know for some people, wearing make up is a barrier, and when the barrier is taken away, they feel vulnerable and scared. And that's normal, in this kind of image-obsessed world.
I just think that everyone is beautiful in their own way, nobody should feel pressured to look a certain way, nobody should feel they have to conform to the stereotype.
Be yourself, not who others think you should be.