To start with I must recongnize admit that I often spend too much money frecuently when it comes to shopping. Articles most often I buy a lot of are dresses, high heeled shoes, and skirts. For two months I didn't could not buy anything during the last two months because I did not have enough money. due to lack of savings In the beginning I'm sure it arrived to I had saved about 600 Euros, but as slow they appeared, as fast they faded I spent all of it right away. 

     The reason behind my spending is that on 22 March I was invited at to attend my classmate's the Confirmation party. by my classmates This happens once at year in my life So I decided to look for the perfect dress to purchase, because a person's Confirmation is a once-in-a-lifetime event.  

     Amount I spent a lot of time spent on coming and going up and down the isles of clothing stores. I enjoyed shopping for my perfect dress up until the last minute, like as a darling child would, but my mum was up to her neck was getting frustrated by my indecisiveness. She deprived herself sacrificed a lot of time shopping with me, and for me without her advice I wouldn't have been capable to decide alone on which dress to buy.

     Finally my eyes remarked spotted one my new dress. It was dark turquoise, with a silk ribbon over the waist, and a little flower in the middle center. It had also featured two fine flounces on both sides of the hips. Without any doubt, it That was my dress; without a doubt. I treated it well carefully maintained my new dress until the day left for the meeting of the Confirmation party.

     I wore my new, beautiful dress to the party, but the high heels I wore were hurting my feet so much that I had to sit for most of it. Anyway I couldn't avoid the pain in my feet, making harder to stand up too much time. Luckily I realized Unfortunately, my ''prince'' of an outfit turned out to be was a frog.

Time for shopping (Thanks for your time)

To start with, I must recongnize  recognize I spend money frecuently frequently when it comes to shopping. (To say it more naturally: To start with, I must admit that I (often) spend a lot of money on shopping.) Articles most often I buy are The items / articles of clothing (that) I buy most often are: dresses, high-heels and skirts. For two months I didn't buy anything due to a lack of savings. In the beginning I'm sure it arrived to 600 euros, but as slow they appeared, as fast they faded. (In the beginning (I'm sure that) I had about 600 euros, but the money went as quickly as it came. That's a very natural way of saying it in English.)

The reason? On 22th March I was invited at the to a confirmation party by my classmates. This happens once at year in my life. (Did you mean: "This usually happens once a year"?) So I decided to look for the perfect dress.

Amount of time spent on coming and going, up and down. ( I don't understand what you mean by this sentence, so I can't correct it.) I enjoyed it until the last minute as a darling child, but my mum was up to her neck. (She was up to her neck in what? You could say "she was up to her neck dealing with the kids/ bringing up the children/ in debt/ with housework) She deprived herself for me. Without her advices (note: advice is an uncountable noun; it can never take the plural) I wouldn't have been capable to able to decide alone.

Finally my eyes remarked one. (Suggestions: Finally my eyes landed on the perfect dress/ Finally I noticed a dress that was perfect for me.) It was dark turquoise, with a silk ribbon over the waist and a little flower in the middle. It had also two fine flounces on both sides of the hip. Without any doubt, it was my dress. (To make it sound more natural:  I had no doubt that this was the (perfect) dress for me.) I treated it well (or: I handled/ treated it with care) until the day left for ("day left for" - do you mean "day before"?) the meeting. Anyway I couldn't avoid the pain in my feet, making harder to stand up too much time (which made it hard to stand for too long.)
Luckily I realized my ''prince'' was a frog.

I love your description of the dress you found. It must have been a delightful moment when you came across it. I was trying to imagine what it looks like as I was reading. I hope my corrections aren't too intimidating. I have made a lot of suggestions, but not for the sake of being critical. I just want to help ;-)