well first of all. i seem to have a lot of problems with coming up with sentences or forming sentences in general. for example when i'm talking to americans or whatever i usually don't really know what to say. but i fully understand them!! and when i'm about to say something. it's almost as if i didn't know any words.. like. i don't know any other english words other than the basic stuff. how can i improve?? please help me. thank you
When learning another language, it's really normal for your comprehension to be way better than your production. Input > output. Just keep talking to people and consuming English media and it will come to you. The more you increase your input, the more fluently and naturally you'll speak -- it won't sound like you're speaking from a textbook.
Like you I also struggle with vocab though. What I like to do for focused study is watch a show or some piece of media and pick out some words I want to learn in context and make flashcards from them.