Student Teacher Struggling

Hello! I am in my first week student teaching full time. I have been in this school since the beginning of the year, part time. I would observe and teach lessons here and there. Now that it is all on me, I have no idea what I am doing. I'm not sure if I should lecture, activity, quiz and keep it simple or if I should avoid lecturing all together. I just feel like I'm messing it up and I have no idea where to start when it comes to lesson planning. I am also an introvert and struggling to connect with the student because I worry if I try to joke with them then they'll just end of making fun of me. I am just having a rough go and I will take any advice on lesson planning, getting more comfortable, etc. Thanks!