well i think i can help becuase im 25 so even though you are younger a lot younger i get it ,i feel what you are saying as i got my first birkin at 19 30cm is divine very comfortable when we are talking about exotics it is a question of wearability and look because when you go for exotics its a beeter size because of use in togo if this is your option i would go for a 35cm remember the birkin is very versatile and can be worn in many ways to make it lok smaller an more formal to larger and spotier the 35cm is perfect in the sense that it provides room capacity and again a series of different looks so if it were me i would go for a 35cm and would not make it black and only black here me out i have point give this woman options especially in paris you can go for the following that are dark colors and provide a mystery to the people who see it on you because at night they look dark almost black and the shock by showing a hint of the color this is just for you to get more chaces on a birkin 35cm togo in paris or open up on the leathers if you like the togo type go for tourillon clemence or vache fjord they are different but not oposites so the colors sorry i tend to drift (very passionate about H) raisin , blue indigo (practically black by the way) or maybe the in the grey areas i mean you dont want to go for a shocking color on your first birkin but black!, my first was black and i would of gone for a darker different shade because i allready had a black kelly that i eventually sold and see look at it this way black is the basic prfect birkin but in a room if you spotted another birkin 80% chance it will be black well this is what i think hope it helps birkel