Yep like others have said, those are not split ends your hair is literally burnt. I'm afraid there is no recovery for it, except to grow it out.
Heat protecting products only work to a certain extent but they do not completely protect your hair from damage.
Still, your hair is totally recoverable itll just take time and patience.
First you should go buy some OGX products, or hit Japanmart up and get Tsubaki~ extra moist. There are better shampoo/conditioner alternatives but these are just the cheapest options that I know of that definitely work for damaged hair. Dont rely on herbal essence or VO5, your hair needs some intense TLC.
You will need to create a hair routine that works for your hair.
OGX is good because they provide products like mousse, hair butter and oils that work well together with their other products so you can experiment with those if you like.
But anyway for your hair routine you need~ shampoo, conditioner, deep hair mask treatment/conditioner, coconut oil, hair oil, hair serum, and optional boar brush, a silk pillow and a silk hair wrap. Focus on getting products with Keratin in it. These are just basics and you can buy extra mousse/butter etc if you need it.
When you wash your hair~ shampoo it as normal but when you condition your hair, turn off the shower, get out, towel dry it to get off the extra water then put your normal conditioner in the damp hair concentrating on the ends. Leave for 5 mins then rinse~ preferably with warm to cold water (cold is best NEVER use hot water). I know this sounds like alot, but it becomes a habit pretty quickly.
Use the deep hair mask once a week, the same way I've said to condition your hair but leave it in 30mins-1 hour longer. You can just tie it up OR put a hair cap on it~ another option~you can glad wrap the hair then put a hair cap on top, and for added effect you can optionally sit under a warm hair dryer to help heat the hair in the cap so it absorbs the moisture. Not too hot tho~ just warm.
Use the coconut oil as a hair mask overnight once a week (you can also add egg and mayonnaise which helps to build up the protein in the hair). Again, use glad wrap/a hair cap to help lock in heat and you can optionally sit under a warm hair dryer for 10-30mins to help. Rinse off in the morning and wash as normal.
Whenever you wash your hair, try to air dry as much as possible. Remember as the water leave the hair follicles it will dry it out, so add hair oil (such argan oil) from midway to the ends to prevent this happening. If you like now you can blow dry it~ but never straighten wet hair as this really damages it. Once your hair is dry add a hair serum to the ends to prevent breakage.
It is best not to brush wet hair, as when hair is wet it is more flexible and prone to damage. Try brushing your hair with your fingers as much as you can. NEVER brush through a tangle, always use your fingers to gently untangle your hair. Make sure you use a good hair brush that is not too old, nor has split or broken bristles. The best brush to use is a boar brush, as they promote the natural production and spread of hair oils that help keep hair strong and healthy from the scalp.
If you want to go the extra mile to protect your hair from damage you can either get a silk pillow or a silk hair wrap that will prevent your hair from pulling and breaking while your sleeping.
You will need to stop straightening if you want to see fast results, but I understand that you probably will end up doing it anyway. Just try your best to keep the straightening on the low and always use heat protectant and make sure your straightener is not too old, nor use it at a setting higher than 130°. Also it would be great if you could get a hair dryer with a cool option to use when drying hair, and a heat option to use when heating your hair caps.
For your hair as it is right now, you can either try all the things I've just listed and see how it goes for a month, whether it improves or not and if it hasnt, give it another chop. Only as far as your comfortable.
As long as you follow a hair routine your hair from the scalp will grow back healthier and stronger. But as long as you continue to use a hair straightener it will continue to split up the shaft.
You can optionally get a weave or hair extensions if you are not comfortable with the current length, and dont be ashamed to wear a wig if you need to. There are some gorgeous wigs out there that look natural and honestly hardly anyone notices.
Trim your hair every 4 weeks for the next few months then re-evaluate your hair needs. Once you really start taking care of it and get into this routine your hair requirements will change as it becomes healthier and stronger.