Neet is one of the most appeared competitive exams for admission into mbbs or bds or bams or bhums or unani or vetenary.

As per your details, your marks really less to get admission into all india category as its one of the option after mbbs or bds which students preffer to get in. 

With 322 marks with only 18 k+ rank in neet ug its difficult to get but as you have sc category to apply for than you must try for it.  

If your rank would have been  10k within than your chance would be higher  to get it easily. 

Your chance to get in bums or vetenary will depend on seats vacancy, no. Of candidates applied. 

You can sit for counseling and give a try to it, but if you don't get better try for next year, you might end up getting mbbs in a good government college with low fees. 

Hopefully you can get what you want. 

Good luck