I looked at few of your games.
You are Black Game 6736921
That Black position does not suggest to me you are in dire
need of instruction on the opening basic principles.
You appear to learning from your opening mistakes. You still have
a slight tendancy to move pieces twice in the opening but nowehere
near as often as you used to.
The above game was perfect, keep following that trend.
Another good middle game but you are now carrying strict development
too far. If your opponent is threatening to win material in the opening
then you should do something about it.
Usually you can defend an attacked e-pawn with a developing move.
Letting it go with no tactical come back is not sound gambit play.
I can see no reason, other than hope why you sacced this e-pawn.
Your e & d-pawns are very important. They are worth more any other
pawn. Don't give them away for nothing.
Though I lke your outlook. 'You attack my e-apwn, I will castle.'
You must understand which positions can stand such a sac. and you
have to have an active development to even consider such a sac.
The good thing about this game is your opponent wasted time
taking a few pawns and you cashed in through sharp play backed
up with your development.
I've seen the good games.
You can do it when you want too just watch those loose pieces/pawns.
You are now at the stage where you want to get better and are looking for the quick way.
There is none.
It's up to you. You stay where you are or put some work in.
The opening is not boring or dull. You are placing your pieces
ready for the all important middle game. You must give yourself
a chance in the middle game.
A small plus you can gain in the opening may become a game
winner in the middle game. A bad opening move can haunt you
for the rest of the game.
Still here? Good.
If you can, join a chess club and play as much as you can.
One of the guys there will play an opening that appeals.
Ask him about it - chess players love to talk about their openings.
Suggest moves, ask questions. Listen.
Play it on here. Go to the RHP database and play over games
from both the weaker and stronger players. You find all the traps
and see the opening blend smoothly into the middle game.
Books: Someone suggested Logical Chess - get it AND READ IT.
It will iron out the wrinkles.
The Most Instructive Games of Chess by Chernev will give you
a boost as well.
You need a basic endgame book, any will do.
Give the section on Rook endings special attention.
It's the most common ending and the most trickiest to master.
Comeback after you have put some work in in these books.
or books of a similiar ilk but I can suggest none better.