Thanks for your query.Based on the facts that you have posted it appears that you have undergone Circumcision
18 days back which has healed up nicely.
You feel very uncomfortable with touching of a cloths to glans penis
This is normal asyour Glans which was covered with foreskin before surgery will take time to get accustomed to these tactile sensations. It takes 2-3 months to get accustomed to this Do not worry things will get resolved soon.