Just for a little perspective - if that 11.2 is accurate (hand-timed PE times are often not), that 11.2 would put you 2nd in the PAC-12 conference champs and 7th in the NCAA National Champs.
If you have accomplished this with no formal training, you are every college track coach’s dream - a diamond in the rough that nobody else knows about.
In the absence of any documented FAT times, it may be difficult to convince a coach that your times are legit. My advice would be to seek out a sanctioned track meet with a Fully Automated Timing system and run. If you can do that 11.2 under those conditions, your ticket is punched, IMO.