CP cp_revobase a1a

Indeed, it certainly looks like a first map. It's absolutely tiny, and very flat. But don't let that discourage you.
Your brushwork is very sloppy. You should stick to a consistent grid size to avoid problems like these:



I'd say you should just practice a little more and look at your favorite maps to see what they do, so you can avoid making poor layouts as much as possible. Familiarise yourself with the Hammer Editor a little more, so you get used to how the brush tool works (and honestly, sometimes, doesn't work).
Good job on getting the entities working, though.