Which opening should I play?

General tip: NEVER EVER ACCEPT THE DRAW - this will bring better results and skills in the long term. Regarding your question - learn middle games that arise after your opening and try to play similar openings (for example slav and caro kan). You may also play one system against anything for example colle or london, and you would play same setup against everything - this way you will always know your plans and where your pieces should go.

FREE CHESS LESSON ON HOW TO FIND A PLAN IN THE OPENING:
www.youtube.com/watch?v=4agYGxT2XtM&t=1s

Yes @SuedeStonn the King's Gambit is the best! If you like to attack like a beast, play this. I used to play bland openings which lead to playable middlegames, but now I play the King's Gambit. It is fun to play, with a bit of risk.