How to get more comfortable enforcing boundaries /turning people down

Hi everyone,

I recently started doing small things to improve my appearance and personality (ex. being more secure and confident).

I’ve been getting a lot more attention from guys (I never used to) and honestly I kind of hate it lol. I’m in doing a degree in a fairly male-dominated field, and my main hobbies are also very male dominated. I never realized how nice it was to just be left alone all time, and now I’m realizing I have a hard time basically telling people “thanks, but I’m happy doing things by myself”. I’m aro/ace so I’m not interested in a relationship, and I’m also quite introverted so I like to keep my circle small.

I’m trying to find ways that I can shut this down without being rude/snappy. I’ll see a lot of these people while at school/doing hobbies, so I don’t want to make things awkward but I also want to be clear that I’m not interesting in forming a friendship outside of these areas. Has anyone else struggled with this before, and if so do you have tips?