I love my job a lot but this weekend I made a ton of mistakes and now I’m terrified my coworkers think I’m useless and I think they won’t trust me anymore

Today was the day I made a ton of mistakes:

-someone needed a price check but didn’t specify what for so I went to see what dept. the item was from. It was in Men’s and I don’t know Men’s sections yet no one else was going to do the price check (or headed to the register when I checked, it had been a few minutes until I went up to the register) so I decided to take a leap and try to find the price. As I went to the Men’s section, one of my coworkers took the item from me and continued the price check since he’s more experienced there. I panicked and said so sorry a lot, except I forgot to mention it was for a price check! I hope the item got back to the register. I’m worried in this case he thinks that I am very bossy and trying to take over his job. 

-we have to get people to sign up for credit cards and someone willingly wanted to today. I went through the whole process and ringed up his items. I didn’t realize he could use the temporary shopping pass for his items/the discount and told him he had to pay with cash or card. At least now I know, but company policy is we can’t lie to our customers whether intentionally or not. In this case I’m afraid of a potential lawsuit if there is one that’s possible or that I’ll be fired. 

(This one is especially stupid to me and I can’t believe I think this right now..)
-my pants really don’t fit and I don’t own any belts. So in between customers I have to pull my pants up so they don’t fall down. For some reason there aren’t any pants in my size that are professional enough for work, a size down is too small and painful, and a size up is too big. Anyway, I’m panicked me pulling up my pants makes my coworkers think I am looking for attention. I really just need a belt and my pants don’t fit!

There were a few more mistakes but they were not as bad or made me overthink as much as those two did.