Advice for Overcoming Social Anxiety and Isolation

hello :) i was wondering if anyone had any advice about the following (i have no idea how to begin this question hahaha). i've never done much of anything in my life before because i've always been too afraid to leave my home. i just was barely able to graduate from high school and i'm unsure as to where i should take my next step since i didn't really think i'd get this far. my mom is fairly supportive of my mental health journey as it's evident that i struggle, but i obviously don't want to be stuck inside for the rest of my life. does anyone with this issue know where to start with putting themselves out there socially? i'd really like to begin experiencing things