Hi,
Firstly, check to see what fluid your gearbox requires by locating the colored sticker on the top of the bellhousing right at the engine back plate. It will tell you whether to use ATF or not.
Secondly, I had a similar problem with my gearbox which appeared to be related to a damaged pin of some kind. When that was replaced, other, more serious problems surfaced and I ended up replacing the gearbox.
Starting in 2nd gear will wear your clutch, of course, but it may be a reasonable option given the problem you have.
Good luck,
Adnan