Can you describe the pain? For me at least, muscle pain generally seems to be an ache or there’s a pulling sensation as well as the pain (indicating muscular tension), whereas if it’s nerve pain it can be a burning sensation, really “sharp” pain, or even just “pure” pain.

Also, can you tell us what exercise activities are you trying that cause this pain? Not all exercises work for everyone (e.g. I do not jog or run because I have foot issues and even walking around for a few hours, despite my orthotics, leaves my feet really sore; on the other hand, I enjoy cycling… when I have the time!).

One suggestion I would have is to see a physio or myo if you can afford it and get checked out - see if they can help you identify which muscles are particularly weak and where you tend to carry tension (depending on how well your interoception works, you may not even be aware of it). Addressing those types of issues can help make exercise a lot less painful (particularly if you have muscular tension issues in certain areas, since that makes the surrounding muscles overwork just to compensate).