1992 Lexus sc400 has very high rpms in low gears

[Lexusdriver7]

Hello, I had bought my Sc400 around 4 months ago. It was bought at 96k miles and now has 99k. Recently when i floor it after being at a stop light my car will reach almost 7k rpms before switching to second gear and will only switch gears if i take my foot off the gas. I sometimes even try to put it in second gear manually but it wont switch gears till i stop accelerating. And even my second gear will get up 6k rpms before switching to third. But my third gear hardly gets over 4rpms. I just dont think this is normal and was wondering if others were having the same issue?