How can I become more attractive to guys? Constructive crit. please!

It is very simple, at least in my opinion. You don't need to dress differently or over sexualize your looks. The easiest way is to share interests with guys. If you want to attract sporty guys, get to know sports, if you want a geek, get to know geeky things. Have an unexpected personality, that way guys will remember you for standing out.

Easiest way to "stand out in the crowd" is to be stylish, which you said you are not. Being "not out of style" is good but you want to be noticed, so you need to be more. Not skanky but show what you got.

5'10 is great height for a woman. Tall but not huge. Definitely a plus. So show that. Wear skirts if you have long/nice legs. By being 5'10 you already have a head start in terms of standing out.

You can turn "coming of unapproachable" to your advantage. When you are out, initiate an innocent conversation with a guy you think is not very attractive. Guys love to think "I'm better than him" and use that as their fuel to approach.

Finally understand that standing out and having more guys are separate things. If you just want to have more guys you can just wear a tight top with cleavage and tiny skirt. You will have more guys. You will actually stand out too but I don't think that's the standing out you want.

Wear clothes that make YOU feel attractive. This doesn't mean you need to wear a flashy halter top or go overboard with makeup - if you feel most comfortable in a pair of jeans and a plain but well-fitting top, then go with that. If you want to try some makeup, I suggest mascara. Mascara can add a huge amount of femininity. It's very noticeable when a person feels good about themselves and THAT is what makes a person stand out. A cloud of confidence can be a heck of an accessory.

Here's some advice:

1. Figure out what your physical assets are (eyes? hair? legs? thin? curves? etc.)
2. Play up those assets with make-up, clothes, shoes, jewelry and anything else that makes sense
3. Put a little flair in your style - buy stuff that you're a little scared to wear but flatters your body and then WEAR IT PROUD!
4. HAVE CONFIDENCE

Confidence is the most attractive quality. But if you normally wear khaki, get some bright red. Teal is in season this year...when all the Christmas clothes go on sale, pick up a few things and give them a try. I bet you'll be nervous at first but then you'll get noticed and get compliments...

Work it, girl!