2001 Volkswagen Passat Transmission?

My car dashboard lights up on everything except drive 4th 3rd and 2nd gear. It freezes up my dashboard where it shows what gear I am in, it's computerized. And I drove it when I was in drive and my car didn't show it I could only go 20 mph if I tried to go faster my Rpms were getting way to high and I didn't wanna blow my motor. But I can shift gears just fine but drive I can only go so fast I tried putting it in first because my car you can go standard or automatic but I can't drive standard so I need help with what's wrong with my car. I just had this problem last night and I parked it and left it because I don't wanna mess it up even more then what it is. -Whitney