Different First and Last Name

Hellllp plz!!

hi everyone
i have a similar problem iam from sudan and we dont use first/last name in sudan only full name . my full name is nahla ahmed elnour and whenever i have to use use first/last name in official papers i go with first name :nahla last name: elnour the problem is in my passport my first name is: nahla and last name: ahmed elnour and this is how i wrote my name in ecfmg my name in my diploma is written as full name i dont know if this is going to be a problem and i dont feel comfortable that my name for the rest of my career is going to be this way do you think i shoud change it????

guys i need help plz asap
we only use full name here (4 names) for example if my name is 1 2 3 4 and in my passport my name is first name: 1 and last name: 2 3 4 does the last name in my ecfmg have to be the 4th name? because i prefer to use the 3rd name as my last name