I want to study photography, and now I specialize in clothing. Is it useful?

Like you, I want to learn photography. There are several kinds of photography, and yours should belong to the category of fashion photography. Some time ago, I read some information and learned that fashion photographers are still very useful. Not to mention traditional industries, online stores that do clothing sales on Taobao now use them. Calm down and do a good job. Stick to it and you will be good at learning.