Feeling insecure,borderline suicudal and unstable.What should I do?

Here we go again,I 18M feel insecure about everything from eyes, nose, teeth,voice ,skintone,ADHD, decent achievements etc. I always try to be social but fail because of my low EQ ,I only have a group of friends from school,I also feel frustrated in the Tier 1 college that god has given me because of FOMO,while I am super active in societies,I feel I am required rather than wanted. My greatest gripe comes from being made fun of for being different,arrange marriage material.Someone even told I would be single and without women if arriange marriage did not exist.There is this 3 month period where I come into the same pit,please help.