Hi and welcome to the forum.
You yourself can be the best judge of how your drug use is affecting you as long as you are been honest with yourself about it, unfortunately many people who use drugs aren’t which is a problem that often goes with the territory. I myself deluded myself for a pretty long time before the effect was so severe that I really had no choice but to accept it, sometimes it’s just a matter of time before you realise the reality of the situation, I just wish I had done so sooner as it would have prevented a shit load of crap, but hey it takes us all different amount of times to get there.
Like ajh151h my situation was pretty intense, it may not be quite the same for you or you might not be at that point yet, perhaps you never will. All our situations especially with a drug like marijuana can be extremely different, some get sucked in and mashed up more than others, but yes we all get affected to some extent, it just depends on the extent to how much of an affect it has on us, but whether it’s relatively subtle of fairly extreme it affects all of us in some kind of way, at the very least the lifestyle of someone who likes to smoke weed to relax is quite often different to someone who likes to run or play sports, they are very different types of culture and after time the longer that you do it for the more likely you are to feel the effects associated. Smoking weed can be a bit of a creeper, you don’t always recognise the effects as they are often slow and sometimes feel fairly subtle, but as time goes by years down the line you can find yourself in a drastically different situation than if you had not been using, it can end up pretty intense or extreme but it can often take some time to get there. Your use from what you have said may not sound that extreme, but even now you are recognising the difference in the person you are slowly turning into to the person you used to be, the fact that you are here and saying what you are saying shows it is happening at least to some extent and like ajh151h says the longer you do it the worse it is going to get. So my advice would also be to nip this gradual change in the bud, pardon the pun that wasn’t even intended and start getting back to the person you want to be.
Anyway that’s just my take on it. If you do want to quit then you are not alone, many others out there are going through exactly the same things, feel free to use us as much as you like to express yourself and ask for advice and support.
Take care, thanks for posting and please keep us posted on how it is going and what you decide.
All the best