Congrats on the Solo! Yes, these smaller GA a/c do feel different with only one aboard.
Mind that 'extended base, with S turn on final' choice, it's half a step into cross-controlling the a/c just when you don't want to be doing so. There's no shame in choosing to go around; it just illustrates your 'airmanship' quiver is has a full load of arrows.
I recently had the same experience you did, as the most oft-used runway at our airport - KHEG - is 4,000' with a hump in the middle. I chose to depart after a suitable wait and two CTAF calls because, for how we were loaded, I could be off by the 'hump point'...and really, what's the alternative? Back-taxi on the taxiway until you find the 'missing a/c'? It's very disappointing how cavalier some pilots are on their radio calls and a wee bit of peer pressure ("Say, I didn't hear you declare you were clear of the active the other day; left me kinda hanging...") wouldn't be an inappropriate thing to say, with a small smile, even if you are in training.
RAF Florida State Liaison
Please visit www.theraf.org