Matheson, 16, claimed his first career goal at Old Trafford to equalise and force United into a penalty shootout with League One Rochdale in the teams' League Cup third round tie.
"I don't think you actually can in words," he said. "But it's a special, special night for me, the players, the coaching staff, the fans. I don't think I can sum it up in words, the feeling, the celebration in the dressing room after was surreal. Something I've never experienced before and I don't think I'll ever experience again.
"I'm going in tomorrow (to school) to make up for it when we've got a day off. Got a psychology exam, so can't wait for that!
"It's gonna be nice, everyone coming up to me [at school] and saying, 'ah, you scored against United'. Most of my best mates are United fans, I've not turned my phone on yet, I'm kind of dreading it! I don't know what tomorrow will be like, I think I'm going go in a little bit later so I can get some rest.
"My education is something I'm very fond of I and I love it. And Rochdale and the school have been so supportive of me with all that, so I love learning.
"It's what I want to do, because football's not a guarantee, you never know what could happen. You could be the best player in the world but anything's possible and it's best to have that back up plan just in case."