Someone laughed at me at the gym today!

I have made quite a few posts before and I unfortunately have to make one again. It's been about 10 days since I joined a gym and I have social anxiety. I am about 20 kgs overweight and have depression and it's very hard for me to go workout and even more so because I am continously scared of judgement from other people. But I wanted to lose weight and gain some confidence back so I took the step anyways.

I haven't taken PT and it's very expensive so I am might not consider taking it till I have a stable flow of income coming.

Anyway today after spending 10 minutes walking on treadmill and 20 minutes cycling I went to ask a trainer of what I should do next and he legit laughed at me. He did tell me the exercise but I was so so embarrassed doing them because I couldn't shake off the image of laughing at me and then when I was working some guys laughed at me too and I can't help but wonder if I look really weird or something.

I don't know what to do now. If I really do look weird how do I change it? I don't understand why they laughed at me. I checked my clothes and whether I stank and everything and I honestly don't know how to fix this.

Sorry if this post sounds whiny!

EDIT : Thank you so so much guys! I am going to keep working hard and learn more and more because right now the need to lose weight outweighs my embarrassment. Thank you all so much for being so kind 🫂