I apologize in advance for
AAT is right; Grammatically, the phrase "I feel painful" is incorrect. You cannot use an adjective as a modifier for feel. However, it is perfectly acceptable to, instead of using the qualifier AAT suggested ("I feel painful sensations"), you may also opt to use an object: I feel pain.
So your options are as follows (using I feel __ as the template):
- use a noun to qualify the adjective painful (I feel
- use a noun as a direct object to enhance the verb feel (I feel pain)
- use an adverb to enhance the verb feel (I feel painfully sick)
Editorial note: When a sentence gets cloudy like this (it's bound to happen, ESPECIALLY in English), your best bet is to try to find a suitable synonym, preferably one that is interchangeable and not cluttered with subtle connotations. (instead of uncomfortable to express pain, perhaps excruciating will do instead) Worst case scenario, you're better off rebuilding the whole sentence. It happens.
Hope this helps