Here is a list of things girls may be insecure about, but really I find attractive or just don't mind.
1. Being Tall
I find a girl being tall to be very sexy. Don't get me wrong short women can be really attractive too, but I have a strong preference for tall women that are like around 5'9+. Their long legs, being closer to my height than most girls, same height or taller than most people, and just the overhaul look of it. Especially when really tall girls that wear heels I find it to be really attractive.
2. Belly Fat
I find girls that have some belly fat for it to be pretty cute whether they're skinny, average, or curvy. I'm not talking about a full on beer belly, but a girl with it can be attractive and a turn on to me.
3. Small Boobs
Having small boobs doesn't make you unnattractive and can be quite the opposite. I know the usual trend these days is that all guys love big boobs, but there are a lot of guys out there including myself that find small boobs to be pretty attractive.
4. Big Forehead
This is one of those "flaws" I find to be pretty cute on girls and never understood too much why girls hated having a big forehead. I get a lot of people make jokes about someone having one, but I believe a girl having a flaw gives her character and something a lot of people agree with.
If you have cellulite guys won't stop being attracted to you. My girlfriend has cellulite and I've never thought anything of it. I understand about all girls have cellulite and it's not really thing they can control and cellulite has never bothered me on a girl whether they were skinny, average, chubby, or curvy.
6. Thigh Gap/Thick Thighs
Having a thigh gap or having thick thighs doesn't make you less attractive and a lot of us guys aren't going to be turned off because you have either of them. Some might, but a lot of us won't. I've seen girls on either side of the spectrum thinking them having a thigh gap is unattractive or them having thick thighs is, but it isn't.
7. Not Having The Perfect Body
Some girls who are skinny want to have the curvy body or wide hips where as some girls who are chubby or curvy may want to be skinny like some of those models where as a girl who has an average body type could be in both. I want to say all three types are attractive to me and I'm not trying to say all bodies are beautiful, they're not. But majority of women I find have attractive bodies and I don't have that much of a problem. Unless you're anorexic or morbidly obese I won't find you unattractive. You don't to look perfect like a model at the end of the day. Try to focus on your health rather than what the beauty trends are.