It is very common that you find it difficult to speak English. Many people have this experience. The best thing to do is to just start speaking and to practice a lot. Another idea is to watch movies or tv shows in English, so you get familiar with the language. If 4 months is enough depends on your goal. If you want to be able to speak somewhat freely 4 months of practice will make a big difference! Good luck :)

Every single day you can learn something new! So do your best!

As a matter of fact, speaking is a difficult skill on its own. There are many people who can read in a language perfectly well and write with few mistakes but fail completely when it comes to speaking. You should just speak, and I assure you it's going to help :) It also won't hurt to take lessons that are focused on conversational practice but aren't pure conversation, so that your vocabulary becomes larger and you use grammatical structures correctly.

Another great way is to write out what you want to say to people. Then, when you are alone, practice the dialogue out loud. When you feel comfortable enough, find someone to talk to and keep your notes around you so you can reference them whenever you need them. As you learn new phrases, write those down too. Eventually, you won't even need the list.

Defiantly you'll need more time but if you work hard, you can get the result you want!