For the first time, I could do exactly what I wanted, without any restrictions.

restrictions 是名词 restriction 的复数形式。restriction 由动词 restrict（限制）加上名词后缀 -ion 构成，意思是"限制、约束"。前缀 re- 表示"再次"，词根 strict 来自拉丁语 strictus，意为"紧的、严格的"。所以 restriction 字面意思是"再次收紧"，引申为"限制"。