I see my younger self reflected in your post. If I may give you some advice, here it is: call what you think it is, judging the action, not the consequences. An innocent tackle may result in no foul and send the recipient to the drydock for a month, and a serious foul play action can end up causing no harm because the offended was lucky.
So simply give what you think you have to give. A player falling to the ground doesn't make the tackle more or less of a foul. I think we agree on this...
A secondary problem may be that your assessment of the actions consistently diverges from that expected by everyone, especially the FA. If obvious fouls look like no fouls for you, then you don't have to work on your personality but on your technique.
I used to be the no-blood-no-foul type of referee, and as you can imagine, many of my games turned into a dissent fest because the players were bloody right. Working on my technique -and being more calmed when officiating- enhanced my abilities, and now most of my games run very smooth and qutite fluid! And I still let a lot of contact, etc., but now I know I'm protecting players appropriately, and they know it.
Good luck, mate!