MacBook Air M1 battery drain rate?

Hello. Is anyone experiencing an unusually huge battery drain? I'm using a 5-month old MacBook Air M1. I have put it on sleep at 84% last night and saw the same battery charge 14 hours later. So, it's not draining while on sleep. HOWEVER, it's draining fast when I use it. To give context, I was just browsing for 10 minutes and then checking my mail and updating one cell in Excel for 5 minutes. From 84% it went down to 80% as of writing this. Is this normal?

Please note that I quit all my apps every night. The only thing that's running is BitDefender. I've been using BitDefender since I bought this laptop and I never had an issue with it draining my batt. Also, my battery settings are already set-up as suggested by Apple. I'm a light user. All that I do with my laptop is browse, randomly use Office apps and watch videos every weekend.