By all means, read 19th-century English if you are interested in literature, and in the history and culture of English-speaking countries. You may struggle, as even some native speakers have trouble with some vocabulary and phrasings that are no longer current . But in terms of your general education, this can be a worthwhile experience.
However, do bear in mind that reading texts that are nearly two hundred years old is unlikely to improve your English. In fact, it could even cause problems, as you are likely to learn outdated and even archaic usages. Very little of the English used in the literature of the 19th century is appropriate for everyday use today.
If you want to improve your English through reading, you need to focus on literature of the mid-20th century or later.