I'm so sad

I got rejected by rp and I don't know what to do.For context, I got 18 point for my o levels I applied to courses through dae and all 3 of my choices got rejected (science courses) even though they were 19 points.. I tried appealing to courses that were 23 points but they had no more vacancies. Now I'll have to study a course I don't like which is engineering, the course they offered. I know this is my fault because I should have worked harder for o levels and now I don't know what to do. I also got offered early childhood in Temasek poly but I'm not interested in it at all. Please help give some advice (please be nice!!) I'm so disappointed