Are You Saying I Don't Understand What I'm Reading in English?
There are many reasons for not understanding what you read in English. Some of these can be listed as lack of language predisposition, lack of system, carelessness, lack of grammar, lack of vocabulary, lack of expression, lack of practice and thinking in Turkish.
Lack of vocabulary and grammar
The most common reason for not being able to understand what you read is a lack of vocabulary. Students generally have difficulty deciphering reading texts for this reason. The way to overcome this is to both increase the vocabulary and enrich the vocabulary by doing lots of reading exercises.
Reading Without a System
Reading for the sake of carelessness or just reading also hinders your understanding. Reading without the awareness that reading exercises play a key role in improving all your English skills, including grammar, has limited returns.