YOu could go to the US and look for a job once there, but for you to stay longer, it's either you get married (and your spouse applies for your spouse visa instead), or a company sponsors your work permit (which is your H-1 visa). The latter is a very hard option as millions of people (through their immigration lawyers) fight for their application to get through the door every October when the US opens the quota for H-1 visas. This door only opens for a few days as once the USCIS have their number of applications, that door is closed until the following year. So you see, you either get a big company to sponsor you to get that app in (coz they can afford fancy lawyers who have connections and all that), or you get in there and look for work in fast food or something and stay there illegally after your 90 days is up.

Or, just go there and visit her and stay your 90 days (DO NOT OVERSTAY AS THIS WILL LOOK BAD ON YOUR RECORD), and leave and then come back, until next year comes, and then get married.