PilotPip is right, it does feel a little different without an instructor.
In my opinion what you are experiencing is common; it's a little different then hoping in a car to go down the block. By the way, what are you the most nervous about? Sometimes I got a little nervous about radios before I went up, but during my intermediate stage (50 hrs PIC cross country) I often flew to busy airports within class B airspace that it became a non issue, in fact I prefer class B now.
Soon enough you'll be so comfortable in a plane that it almost gets to the point where it feels as natural as driving to the grocery store. Just don't ever relax so much to the point that you are skipping things. Always do your checklists, and you should be fine.
Happy flying.