So i have been looking around for a cheap STP and the cheapest one i can find that has good reviews is the GoGirl (or the shewee i know is another name i think) what are your opinions on it? Is it good for a first STP for the price)

I have used both. I prefer the SheWee.  The GoGirl is a soft silicone funnel. The SheWee is a hard plastic that is coated with something that makes it easy to shake off any excess liquid.  The SheWee can also be used to easily wipe any excess liquid from the body.  The GoGirl works fine as long as you hold it gently (it collapses easily) and you have access to water to rinse it when finished.

I have a Go Girl as well.  Are you planning to keep it secretly in your pants all the time, or just try out urinating while standing?  I does work to pee.  And it is soft enough to tuck into the waistband of pants.  I find the flimsiness to be an extra challenge to actually using it.  The problem for me is that I can't quite feel whether or not I am pressing it in place firmly enough or not.  With a thicker or stiffer stp, I can feel the pressure down there, which enables me to pee confidently.  With this one, you have to be careful to apply enough pressure to create a seal around the back, but not so much pressure that the funnel collapses on itself.  Like Jayden said, it works if you hold it gently.  Of course, this is true in various degrees of all stps.

i probably wont keep it down their all the time. I do pack most of the time. I would probably keep in my pocket or something. Plus i am shy so i am a stall kinda guy not a social pee-er. It would also be temporary until i can afford something nicer.

I never tried the gogirl but I bought a mr limpy stp for just around £22 from Tranzwear. I was surprised to find a proper stp that was that cheap and it actually works too.

In my opinion - ( I have tried almost all of them) - you will be much more satisfied with the SheWee for a temporary, carry in your pocket option.  Unless you are looking for a pack and pee option like Eli's mentioned.  SheWee is also available on Amazon.

Check out the p-style... They are pretty indestructible, relatively cheap, easy to clean, the clear ones are almost invisible, and IT WORKS!  I have NEVER wet my pants with it.  The one serious drawback is that it is difficult to conceal unless you wear cargo shorts or a jacket or pants with big pockets.  It is not at all flexible (which is why it is leak-proof) so it cannot be folded up and easily stored in your pocket.  I have NOT had good luck with any other STP, particularly the soft ones, and have tried to make my own inventions, but the p-style is just the only thing that works for me...so far.

I have the go girl, have had it for years. Never had much of an issue with it. Found it easy to use and I like that its not super hard because you can fold it up and hide it unlike the hard plastic ones. If you follow the instructions on how to use it you should be fine.
I recently did a search for general stps and found what I thought was fairly cheap with almost four stars on amazon. Not sure if I can post the link but its called p ez.