Well, please post a pic of your haircut?
Im sure you're looking at it all wrong and you can actually do something really cool with it, but you just don't have any ideas.

But, if you really want extensions you should go back to the hair salon and ask them to do it for you!! I bet it will be way less than 300 dollars!!

OR You could actually go to Sally's and purchase clip ins for about $100 (way less than 300!)
I found these depending on what length you want
14 inch http://www.sallybeauty.com/hair-extensions/EURNXT1,default,pd.html
18 Inch http://www.sallybeauty.com/hair-extensions/EURNXT02,default,pd.html?cgid=Hair16

I suggest purchasing them in-store instead of online to make sure you've got the right color :)

Hope this helps ^__^

Okay well I love hair extensions and especially the clip in ones. They are a tad bit expensive if you go the sallys route. I always tell people to get the brand name, the price, and head it up online. Online is the best way to shop for your hair care needs. Ebay is seriously the best for it. I got some clip ins for $15 for 14" once because the lady was overstocked with it.
I think you should speak with the associates at Sallys and ask which, synthetic, or human hair extensions would look the best. What colors look the best with me and also the pricing of each.
Now I don't know if your dad will let you go online to do that sort of thing, but I'm sure if you do the research and tell him the price differences he'll be more than happy to let you do it.

Honestly it sounds to me that your dad wants it professionally done with a $300 limit. My hair in the picture is fusion hair. It was down to the underside of my bust and I loved it. One pack of hair was all I needed for that, but a lot of people need two. You also need to take that into consideration. How many pack will I need.

So I hoped this helped some.

I got my extensions from sallys for about $90 they come with the clip already in) there are also like $15 ones that you have to soe in the clips (big hastle)... NO way you will need $300 unless your getting glue in extensions. the back length of your hair may be a problem but ask the lady that works there if it will work... she will most likely let you put a few in your hair to check (: and if the extensions are to long, you can always cut them

Unfortunately my iPod won't let me post pictures but my hair is similar to Vanessa hudgens hair thanks for answering

My dad is kinda clueless when it comes to makeup and hair so that's why he said $300 I want to buy them at a store because if I need more I can just go back to the store thanks for ur help :)