I was just watching vinnys run in load our last souls and wtf is he doing so much damage :(, no wonder I have such a hard time...I wonder if i kinda fucked up the whole game...I mean I could just farm so much to increase my stats for weapon scaling but that would take soo long.
two choices, get the Very Large Ember from the ghost place and upgrade your weapon to +15, and increase your dexterity or strength to 40 depending on which your weapon scales best for. This is what Vinny did and is the absolute best way to maximize your damage, you can also buff a +15 weapon to do even more damage.
OR create an elemental weapon. Upgrade your +10 weapon into a +5 Lightning or +5 Fire weapon and it will do more damage than a normal +10 weapon. It doesn't scale with stats well (you can have minimum str and dex) and is the slightly worse route to go down but you will easily have enough damage to beat the game. Personally I would do this in your situation.