Playing only 1-1.5h at a time should not be a reason to avoid grouping. You can do pretty much any quest in the game within this timeframe (avoid the quest chains though if you don't know them well).
That being said, by looking at your build, it looks like you're too squishy. Starting at 8-9 base Con is not recommended, especially for a new player. And ranger/rogue are rather low HP classes to start with, so high Con is even more important. It's not surprising you are having trouble soloing.
Loot is pretty much always going to be under your level when you run quests at your level, that's normal. You'll discover the twinking fun on your next character
If you want to keep leveling this character, my suggestion would be to just keep farming the quests you can do without much trouble to get XP as fast as you can (= just zerg these quests). As you increase in level then you can start tackling higher level quests, etc. It's better IMHO to wait than to waste time and resources trying to complete a quest you are struggling with.
Just be aware: this kind of build is not the most solo-friendly, and it'll get worse as you level up. And I'm not too sure what's your leveling plan, but typically rogue/ranger will either focus mostly on rogue or on ranger. It's usually better than deep multiclassing, which makes you lose the classes' highest level abilities.