I agree with B. Diddy, it's unlikely that having NFC enabled is a source to your perceived problem. Do note you can easily just disable/enable NFC for when you don't need it or when you do, but otherwise beyond an inch or so it's not going to be detectable.
Bluetooth 'might' be an issue is its use range involves several feet, but like NFC it also requires your intentional interactivity to allow or deny connectivity, and just not very common threat either.
WiFi or cellular connectivity might be more likely pathways for remote code compromises, the former involves several yards of coverage range and the latter several miles. But despite the fear-mongering from most tech news floating around, having your phone actually compromised by some kind of remote code execution isn't likely. Yes there are numerous targeted attacks that are very potent and effective but here in the real world most of us simply aren't that important to be attracting that kind of attention.
But without more actual details as to why you think your phone is being compromised, a much more likely issue most of us need to be more judicious about is protecting our online presence. Email services, social media services, financial services, etc., and other services that reside online are bigger and occasionally more vulnerable than your phone. So, just as an example, if some moron has compromised your Instagram account in some way it's not so much the Instagram app on your phone that is the problem, it's your online Instagram account that you need to look into.