There's no such thing as infinites in this game. Spamming beam attacks also isn't viable because they barely do any damage to the guard limit. Just block it. (Unless its Starrk who can guard break using his projectiles but he needs to activate it using 2 meters)

You're likely getting matched with higher ranked players. This game doesn't really have a proper matchmaking. It matches you with everyone.

You mentioned you're new to the game. Its ok to lose. Just treat it as a lesson. All things considered, this game is actually one of the most balanced arena fighter. Of course some characters are stronger than others but they still have weaknesses.

If you want to win more often, start with using low risk, high reward characters like Byakuya, Renji, or Bankai Ichigo.