I'm a Freshman in HS.
And I'm going to Senior Prom with a Senior!

I know, Wow

But uhm, I'm scared.it's in like 20 days.
I have no dress.
No ideas for dress or colors.
I have boy short hair so
What can I do with my hair?

And shoes
And anything else!

I also wear glasses daily
Should I get contacts for this occasion?

Hun PM me a full body pic of you and we'll go from there!

First off you might need to relax a little. If you continue like this, you are going to be exhausted by the time the prom comes around. You can begin from the inside out, eat lots of fruit and vegetables and drink lots of water, it’s good for your skin. Your hair will be just fine as it is, shiny and clean and smelling of a nice conditioner. Contacts might give you a bit more confidence on the night so not a bad idea, and try to wear them on and off till then to get used to them, the same thing goes for new shoes. As to the dress, choose something soft and pale in your favourite colour and, depending on your personality, I would keep it simple. Going to a dress hire shop and asking for some advice about choosing a prom dress may be a good idea. You don’t actually have to hire anything just get some advice and then say you’ll come back later. I hope it all goes well and you have a great time.

Remember you're a freshmen so pick something out that you will feel comfortable in. the color of your dress is something that you must choose carefully. At my prom turquoise was the most popular color, because that color was "in". If you don't want to be like everyone else pick a color you think no one will have on (someone might have that color on, there's not that may colors to choose from).

If your hair is really really short; ware your hair like it is, but put a nice diamond barrette in it. If it's long enough wear curls (you can never go wrong with that) add a barrette to that too if you want.

Bluerose is right about the shoes, and the contacts. Make sure you buy some shoes with a nice heel (not to high not to low) if you plan on dancing you want to be able to dance in your shoes without your feet hurting. (I hate when girls take off their shoes and start dancing)