You don't have to straighten your hair because it's curly. There's a lot of gentiles with curly hair. It's not inherently only a jewish trait. jews have a kinky curly type hair from race mixing constantly with people of African decent. But curly locks are still a gentile trait. You don't have to change anything about yourself because you think it makes you look like a jew. Curly hair is beautiful, there are even some of our Gods who have wavy or curly hair. You should accept your own gentile beauty without fear.
If you ever do decide to do anything to change your appearance, do it because you truly want to, not because you're ashamed of your looks and want to alter them. You really don't have to change anything about yourself. You are fine as you are.
I have straightened my wavy hair in the past because I just wanted to try something new, I used a protective spray and then I used lots of oil and conditioner after to keep it silky. It still caused some damage to my ends and I do still regret it a little, if not done correctly it can cause damage. So always keep this in mind.
