Well, you feel this way for a reason. And you did what you did for what ... ? Really, why would be fun to ruin your entertainment by degrading the difficulty level, so you'll feel bored instead of rewarded for being successful at the game?
This kind of playing are the worst of both words in my opinion. If you want to do powergaming, then do it in a proper way. Same goes for normal / balanced playthroughs, even if in this case it only means to literally play the game and let it flow naturally instead of applying a strictly utilitarian logic. Mixing different approaches are always risky, but what strange to me is how you missed considering the consequences of your actions in advance. Okay, you get some neat weaponry at level 10 ... then what? Especially that nobody selling these kind of stuff at this phase of the game (it's not a coincidence), so it was clear from the start that you have to use some kind of trick to get the desired weapon.
Even with that, you could have chosen a more fitting and stylish way to get it. Do you want a Sniper Rifle? Do your homework to learn where you can find one regardless of your level! Thus go to the building not far from Mole Rat Ranch, pick the locks and voilà! (Yes, I know that you had low level skills, but still.) Or if you're on PC just use some console commands to add one to your inventory - that'd be the most polished way I think. Or if we already speaking about DLCs, I've read several times that travelling to the to Divide - collecting stuff - going back route is a favourable way to lay your hands on some decent gear at low level. But starting Dead Money and rushing through it (because you cannot go back without completing it IIRC) just for the loot sounds like one of, if not the worst scenario to me.
Obviously you can do whatever you can in your own game sessions, but I don't see why you should continue this character. If you get to the point where have to looking for challenge because reasons like this, it's not a good look at all.