掲示板 Forums - A little help please
Top > 日本語を勉強しましょう / Let's study Japanese! > Anything About Japanese
You are in the right place to ask doubts! We welcome everyone! 
It's just 'interest vs amount'.
Not very A (あまり) => Refers to degree or amount.
Ex : I don't like it very much.
Ex : It's not very much tasty.
Not really A (べつに) => Refers to importance or interest.
Ex : Did you like something? Ans : 別に (not really)
Ex : Anything happened? Ans : 別に (not really)
Be sure to negate the verbs. nouns etc. when you add あまり & べつに.
Have you tried visiting the grammar library under Resources ?
Quoting user @lou1sb from there :
別に by itself can be an informal or dismissive answer to a question, similar to ”not really” in English
These external resources should make you clear :
あまり~ない indicates that the degree or extent of something is not high or great, as in "not very" or "not much."
Trouble understanding different meanings of べつに
Top > 日本語を勉強しましょう / Let's study Japanese! > Anything About Japanese