Awkward school situation

I dropped out of school 3 years ago leaving with no a levels. I dropped out due to mental health issues. In a couple of days time I am going to a carol concert with a friend maybe two that the school runs at the local church ( I used to be part of the choir). My two friends who I don’t see a lot one of them I see during the holidays because we play football with other people. Two of them go to Uni one of them is very smart and I am guessing got amazing grades for his a levels. I am feeling nervous because this is the first school event I am attending since dropping out and people don’t really know what went down in addition to that I have also been doing a online course which was HR to begin with but because I was taking so long has turned into admin course which as a male is a little embarrassing. I am probably gonna lie about the admin part and say I am about to complete a HR course that was half online half in house but I still feel a little weird about seeing people and teachers letting them know what I am doing. Any thoughts or advice?