Why do I suck with black pieces?


I suggest looking at opening principles. In your game against Yoviznando, you played an early Nc6. I suggest not playing Nc6 with d4 and play Nf6 instead. It prevents c5 from being played, like c4 in the Sicilian when Nc3 is played.
Then after that there were simple mistakes/blunders like not observing diagonals and losing your queen. So, you have to be careful of the threats. Work to castle first before you bring out the queen and develop your pieces (kingside to start with is better).
don't look down on urself, trust me you can be better...memorize some good openings for black along with its variations and traps... practice it in unrated games first until you are used to playing as black.. don't start with fast time control..
I think the proper advice would be to look into opening defences for black and when to use which. I also happen to have an issue playing Black and I'm much more likely lose with it

I play about the same with black pieces.

When you study the game in terms of the white pieces, there's never a question about whether or not to flip the board. When you study in terms of the black pieces, you can look at it from either direction. It turns playing Black into a counter-intuitive process. Also, it means that you'll need to know what an opening for Black looks like from two directions.

I felt the same before. Tried learning a little bit of the Sicilian, KID, Nimzo, Caro, French, etc. Forced myself to play 5-10 games with each (only learning the first like 4 moves or so of each), and then I found that I was much more comfortable with a couple of them. I've been enjoying playing black even more than white lately tbh.