To me it looks like you need to focus on the opening principles instead of particular openings. Openings will come in time, but if you stick to the fundamental opening principles, you will actually find yourself naturally playing openings without even thinking of it. Some opening principles include:
- Control the center
- Develop your pieces (Knights, Bishops, etc)
- Castle early (this
should connect your rooks)
- Try not to move the same piece twice in a row
- Try not to move more than 3 pawns in the first 8 moves
By sticking to the principles above, you will notice that you are in fact playing an opening and you don't even have to think about it, for now, at least.
Let's use the Ruy Lopez as an example:
1. e4 - controls the center and opens the diagonal for the Queen and the Bishop
1... e5 - fights for center control and opens the diagonal for the Queen and the Bishop
2. Nf3 - Gets a piece out and controls a center square, plus attacking blacks e5 pawn.
2... Nc6 - Black gets a piece out and protects his e5 pawn
3. Bb5 - Puts a pin on Black's c3 Knight.
A possible continuation for White and Black might be to castle, although with the Ruy Lopez, this can wait a few more moves.
I would also recommend if possible and this is only if you want to try and practice e4 openings, to either ask your friends if you can play as White or seek games and play as White for a while. I did this with the Scotch, Italian, Evan's Gambit and became much better after playing them from White's perspective for a while.
Your gonna get moves from Black that don't follow 1. e4 e5 openings, but to illustrate an example from my own experience, just stick to the principles and you should be fine, no matter if you lose or win, you will learn something. I will use the Sicilian as an example. I am not an expert in the Sicilian, so when I play against it, I have no idea if I am playing an opening or not.
1. e4 - I want control of the center.
1... c5 - Sicilian
2. Nf3 - I want to develop a piece
2... d6
3. d4 - I make this move because I want to break up the center and open the game up. It kind of reminds me of the Scotch a bit, but others might disagree.
3... cxd4
4. Nxd4
4... Nf6- Attack e4 pawn and develop a piece
5. Nc3 - Protect e4 pawn and develop a piece
If you looked at the board now, you would notice that White is close to castling, he has a pawn in the center, and both Knights are developed and there are open lines for his Queen and Bishops. Black's next move is an important strategic choice, but I wouldn't worry to much about it, I would just play. My main point above is that I had no idea how to play against the Sicilian, I just played the moves that felt natural to move at the time and come to find out, this is called the Open Sicilian