Patroklos:I shouldn't be a Tour Pro
Well your score indicate you shoot par, or close so that would say you are tiered correctly.
I note you do have a variety of clubs, mostly with different meter speeds which may be causing consistency in hitting the ding. So at some stage some upgrades are required. Perhaps getting a full set of G20's would help you hit more GIR, therefore improving your scores. Also save money by using a cheaper ball as your clubs will not get the full benefit of using a premium ball. You also will notice a big difference if you get 2 or 3 good wedges, and this will help your short game immensely.
Personally I would forego playing credit games until you can upgrade your equipment AND practice as your game obviously could use some. So axxrue those credits to purchase the equipment and with practice, you too could find yourself shooting those scores.
This game is not easy to master (and I am far from doing it yet), but is possible with some patience. Also read (and search) the forums for tips - there is a plethora of great information in here to help players of all levels.
Most importantly, set yourself goals and enjoy the game.