you have A LOT of hair 
.
. 
Protective Styling, covering hair with a silk or satin scarf / bonnet and mosturizing with products that don't contain huge amounts of mineral oil and / or petrolatum is what grew my hair from neck length to almost armpit length in just 2 years! HHG!
Vkb's post was completely on point. I just wanted to clarify, in case you didn't know (and I apologize if you already did) the distinction between moisturizing and sealing. A moisturizer is typically water-based, since water is truly the master moisturizer, and contains other emollients and ingredients that coat (and, at times) penetrate the hair shaft. An example of a moisturizer would be a leave-in conditioner like Alba Botanical's detangler or Kinky Curly Knot today, as well as Qhemet Biologics Burdock Root Cream. A sealer is a product that is not water-based and helps to retard the evaporation of the moisturizer from the hair. Sealers include plant butters (such as shea, illipe, cocoa, etc.). You would moisturize first and then seal. Again, my apologies if this is redundant. ). I personally have fine strands. In fact, the majority of Afro-textured hair is actually fine, not coarse. I hope that this helps you. Feel free to send a personal message if you have any questions! 
Welcome! You have a gorgeous head of hair. I bet if you straightened it (temporarily of course!) you would see that you are well on your way to having hair down your back.
To prevent breakage you need to be gentle with your hair. For some poeple that means only fingercombing to detangle or only detangling when hair is soaked with water, oil, and/or conditioner. Only using a wide tooth comb (seamless is best) or a deman brush.
Your ends are the oldest part of your hair so if you want long hair you need to give them special attention. Detangle from the bottom up, give extra moisture/oil to the ends, and keep them from brushing against your clothes as much as possible. Keeping your ends tucked away from the air is the ultimate way to protect them. Around here we call that protective styling.
Sleep with silk or satin on your hair to prevent dryness. Cotton is a
I used to have hair that sucked up moisture when I joined hair boards and I turned that around by eliminating shampoo, washing with conditioner instead, and deep conditioning my hair several times a week. I would also sleep with conditioner mixes in my hair overnight before rinsing it out the next morning.
There is a lot more that can be said but I know that many other ladies will be chiming in.
