Thank you so much 정복 and dmacleanv2iii for your corrections are encouragements! :)

I know how you feel! I feel the same with my German. 한국어 잘 하시는데요! Don't judge yourself when speaking. Remember that speaking time is not class. As long as the conversation is flowing, people will be happy. It seems like you already know more than enough Korean to hold a decent conversation. The practice is more for your comfort than anything!

나는 한국어를 배운지(배우기 시작한제) 삼학기 째인 학생이다. Or 내가 한국어를 배운지도 삼학기나 됐다. 근데 아직도 말하기가 좀 불편하다. 내년 가을에 한국에 가는데 걱정이 많이 된다. 한국어를 잘 한지 생각하다?(couldn't get what u tried to mean to) 한국 친구하고 말할때 너무 떨린다. 여러분들하고 많이 말을 나누고(대화하고) 싶다. Guess your korean is enough for a daily conversation. Don't be afraid and just talk more and more, and your Korean will get better.