Absolutely not. as long as you go into it knowing your map is classed as 'newbie' since you're new to mapping, and you understand that when recieving reviews, I'm very happy for new maps to be in the wad section.
Back when I read tutorials on how to map for the Source engine I somewhere read the phrase "Never release your first map", so I'd say as long as you stay with that, it's fine.
Because usually first maps are just simple rooms with doors and such to test out how the editor even works.
