Is it possible for me to lose weight?

I've been trying to lose weight for the past years but I haven't been successful and now I'm the heaviest I've ever been. My mom keeps telling me it isn't possible to lose weight because I'm on two different medications that have weight gain as a side effect which means I will only ever get bigger.

I workout every day either on my exercise bike or I do strength stuff and I'm trying to eat good too which is difficult because I like veggies but she hates them. When I'm finished workout out I just kinda sit in bed for the rest of the day because I have nothing else to do. I have been told I look like a whale