I started working somewhere in retail about a month ago. After about 4 days of working there I got covid-19 and was out for 2 weeks. During that time I got paid sick leave(50% of hourly pay). I came back and have worked about 6 days so far. I just got an offer for a job in my field which will pay me about 100% more than I make now. However I feel bad about quitting because they gave me paid sick leave and I'm a new employee there. Is it wrong for me to quit?
Paid sick leave is a benefit that your company granted to you. If you weren't entitled to sick pay then you wouldn't have received it. You didn't receive anything to which you weren't entitled, by the fact of their granting it to you.
If the company was going to let you go, they wouldn't feel bad. This isn't a moral or ethical quandary. You owe them the work that they pay you for. Nothing more or less. They granted a sick pay benefit to you. You owe them nothing in return.
Should you feel bad? I wouldn't.
Is it wrong for me to quit?
No - you took the sick leave and it's accompanying pay in good faith, and retail is almost universally a fairly high-turnover sector and this is for not just a job in your field but a 100% pay increase. Give them the required notice and work it professionally. Don't be a d##k about it during your notice and go enjoy your progression to a more relevant job.