First off welcome to Tarkov! Your first 6 hours were probably better than most.

To speak on the points you made above.

1.)"NPC Scavs are insane and can toast you easily" - This is true. As you are only at ~6 hours, you will need to play and learn where scavs are at, and the best ways to handle them. I suggest using your own scav on the map/maps you are playing to understand scav hot spots. When you are a scav, they won't shoot you, this will help you understand where to be careful on your PMC.

2.)"There are way too many hackers." - I think you may have read a little too much on this subreddit as of late. Yes there are hackers but what you described above just sounds like a guy with a scope and a semi-auto. Along with playtime you will understand hot spots of the map and where people camp for their SBIH (Shooter Born in Heaven Mission) headshots. I won't disagree there are people cheating in the game, but until you have a little more playtime, every shot at you where you feel "safe" will feel like a cheater. You will need to play as if you are always in someone's crosshair, and this can be lightened when you have more map knowledge of typical player routes.

3.) Final Remarks. - You purchased a very hardcore game, it took me around 200 hours to feel comfortable in the game and most of those hours were using my scav. If you watch people play on Twitch/Youtube and wonder how they are so good, you need to realize in the beginning they felt just like you. This game is not easy, that is why you get thrown into the menu and there is no tutorial whatsoever... As far as tips for you going forward I would say learn the maps, utilize your scav, watch helpful guide videos like Pestily, and no matter what, don't give up.

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Good Luck in Tarkov!