Question about hair.?

Right now, I have really shaggy, curly, messy, etc. hair. I want to get it long, & people have told me 3 things:

1. I can't have long hair. It's curly.
2. If I want long hair, I’ve to keep trimming my shaggy hair…until it gets nice.
3. I’m going through a “long-hair” stage. My hair won't stay so messed up and shaggy forever. Eventually it will become long enough to tame.

#1 doesn't make sense to me. How did Slash get his hair so long? and his hair is curlier than mine!
#2 & #3: I have no idea about.

What should I do?? Will my shaggy curly hair get longer? or will it just turn into a massive afro? How did Slash get his hair so long? it's curly!

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Answer:
Yes you can have long hair. The longer it grows the more weight on the curls so they rest somewhat. You need to use a pro line of products for curly hair. Moisturizing shampoo/conditioner. Styling like Joico Silk Results, Paul Mitchell Super Skinny Serum. Get a trim (1/2″) every 3-4 of months so if there are split ends they won't travel up the hair strand & make it frizzy.