Body shaming is a major cause of inferiority complex that a lot of either plus sized people are facing or that might not look a certain way that the generality of the public sees to be okay with them and that has led to depression and taking of drugs just to blend into what is generally accepted in the society as her norms.
If you feel healthy being fat and in the long run there is not going to be a threat to you because of your plus size, then there is no need trying to stress yourself about it just to please others. we as humans don't have a say when it comes to the body we are created with. we all grew up to see that we are either fat, short, slim or tall and had to embrace who we are. if you decides to work out just to look a certain way, that is totally fine but if it is because of the opinion of others, then that is not worth it.
the goal is to not just look healthy but to be actually healthy. you can be slim fitted and still be sick while another can be fat or chubby and be damn healthy within.