Salut je vais essayé de t'aider:)
Hi ! I would like to thank all of you for being here. I'm so happy to have my BAC and thank you for all of you for supporting me, i am very thankful. I would like to thank especially both of you , mom and dad, because you did everything you could to make sure we got a good education. As you tell us, it wasn't an easy path and you made a lot of sacrifices but today i am here to tell you that i am very grateful and i hope you are proud of me. And even if sometimes our cultures are kind of embarassing for me because this is very different from Great Britain ones, i am still very happy to have you here with me and i love you :)
VOILA! j'ai juste fait un modèle. Tu peux aussi reformuler ou rajouter des trucs :)