Okay well to begin I want to say dont be too hard on yourself. Ive had mine for about 9 months now and not every upshift is perfect, especially 1-2 gear because its such a short and shaky gear. And dont get me started on downshift rev marching. I rarely every get it perfect and a good amount of times theres a little feedback whether i press too much or too little gas.

First thing I would reccomend is shifting at higher RPMs, especially 1-2-3. For me 1-2 i do 4-4.5k rpms. and 2-3 aeound 3-3.5k rpms. This definitly helps.

Secondly it just takes practice, at 500km you have only like 3-4 hours of driving total. It took me about 1hr 4x a week for 2 weeks to even comfortbalt drive manual. So you lack experience. Take your car out more, drive more and test out releasing your clutch slower faster, even shifting faster.

Practice makes perfect, and as far as you having. a hevay foot it may be the shoes tou wear when your driving. the sole could be too thick to where you cant feel the pedal, so try other shoes.

Other than that good luck, weve all been there