I was actually just like u when i was on my first semester...i'm now in 2nd sem.
it's normal to feel threatened/uncomfortable especially when this is ur first time, just like u, i've never worked in any kind of medical department whatsoever, but my mom is a nurse, and i'm only 18! lol so u can tell how nervous i was! plus i'm not fluent in english, which makes it double hard for me to talk to patients..
but u know what? my advice is to practice everything u learned from lab! since i am studying in a private nursing school, they provides us lots of resources, so after class we will have "open lab" when the professor will stay and u can practice all the skills u learned so far, i think if u master all those skills u learned, it shouldn't be too hard when u go to clinicals...
another tip is to act more comfortable, eventhough u may seem nervous, don't let it show! right now, i find that i'm more comfortable going in to patient's room, introduce urself, i usually say something like "hi, my name is .....and i'm a student nurse, nice to meet you, do u need anything? is there anything i could help u with?" and since we always do A.M care, i usually offer a "bed bath" so they could eat afterwards...and that's it! then tell them u will be coming in and out of his/her room...take their vital signs and do ur assessments as usual, they usually don't ask coz they are used to nurses just coming in and taking their vital signs...
another one, always smile!! believe me, it brightens their day! especially in the morning! and talk to them casually, i find that talking to them in a normal way like u would with ur friend/classmates makes them open up to u more, and u wouldn't feel nervous!
also, before u enter the room, make sure u know what ur going to say, i usually practice what i'm going to say so i don't stutter when i'm actually talking to the patient...
and be friendly with the nurses! smile at them and ask them politely if u need something but don't ask or bother them when they are doing something like giving meds, coz they will ignore u...i always try to find the right timing when they don't seem busy.
so yeah, i'm sure u'll get through that phase once u get the hang of it, it's still ur first sem, so u have a looong way to go! and u will be more comfortable in time!
just breath in and breath out, be urself, smile more, prepare before u go in to the patient's room, and don't show any signs of nervousness when u talk to the patient. u'll make it through! if i made it, i'm sure there's no reason why u couldn't....trust in urself and be more confident