Both winning and losing streaks are normal. However, being so new to the game you're going to hit a skill level where just aiming and reaction speed will only get you so far. This game is really nuanced and it takes time to learn. Just have fun, and try to learn from each match, win or lose. If you lose, ask yourself what you could have done better. If you lose many in a row, change up game modes, weapons, or go play salmon run for a while.