Why am I stuck in 1h long games that are lost in the pick phase
If you aren't in high MMR the pick phase literally doesn't matter. Everyone is so retarded and there really isn't meta until you get into prebuilt high MMR teams. You shouldn't listen to retards on youtube trying to define current meta. If you're good you could roll the carrys' heads with Vengeful or any hard support if you're decent.
Hero was already terrible.
Offlane solo doom is great. Most people play him as a teamfight support which is great for countering certain heroes but if you play him as a melee carry you're one of the strongest strength heroes with high regen and insane uptime for movement speed. IIRC he has 50% uptime on scorched Earth making you one of the fastest and tankiest early/mid game team heroes. Sometimes having Doom up is scarier for the enemy committing than even using Doom, so you can harass and outlane most melee carries and their support. Doom is also insane as a jungler-hunter. Doom is also the ultimate Axe counterpick.
If you're ever up against a solo carry or two safelaners who are melee, try maxing infernal blade first. It has more damage potential than even Ogremagi at level 7. It has almost zero cooldown too. Instead of phase boots for chase potential try treads and then swap to phase boots later, if your positioning catches someone off guard you're already faster than most people, plus tread swapping helps immensely with flat mana regen as doom has a small mana pool early on. The Kobold Foremans give a +3 FLAT mana/s which is enough to sustain your mana pool for tread swap casting indefinitely. Getting 2 Infernal Blades off is instant death for a support or carry early game. You can disregard auto attacks if someone turns around and runs and simply follow them for those juicy infernal bitchslaps.
One thing some people don't understand when counterpicking is that you need to know every hero's power spike timeframes and where yours will fit in. Doom has a massive power spike between 4-7. Your powerspike goal is being able to bully the safelane carry and support out of the lane unless they hard counter you ie antimage, viper, rubic, etc. Against, say, a Huskar who has a very early power spike and then an insane spike around 7-11 or if fed, your spike window should allow you to shit on them for a solid 5-10 minutes. If done correctly you can just bully them for the rest of the game. Being able to shit on a single person is Doom's greatest asset. It's essentially his core mechanic. If you can shut down a role 1 you've basically won the early and mid game.
Take note that Doom's winrate skyrockets when games go longer than 40 minutes by a huge margin, a facet some people overlook when counterpicking:
Also Veil of Discord is underrated on Doom.