How much I make annually??

So I’m 20 years old and I really want to becomes financially successful this year so I can make some lifestyle changes and I’m starting with budgeting and building my credit. My only issue is in order to apply for my credit card, they are requesting that I enter how much I make annually and I’m not sure of that. Like I’ve only had 3 jobs the whole year of 2020 and one of them I just started in December. Can anyone offer any help on how I can calculate this?