A-Level choice (please help)

IMO those subjects are perfect for architecture if you're into that

Next week is the due date for my A-level choices. Right now im thinking to do; Maths, Physics and Art. I didn't choose these topics for a specific career but to provide me with a large choice in the future. However, i feel really lost. I am not sure where I want to go and have nothing to work on now for my actual career which makes me feel behind. All i have is, to finish my GCSEs with a good grade ,then what? I originally wanted to learn neuroscience but that faded away because I researched the job and realised it looks really hard and i don't want that life. I think im just lazy. I dont know my worth and what I can do so im stuggling alot. Lots of people in my school pick Physics for A-Levels so I decided to aswell. For some reason, I want to do lots of stuff like being an Engineer(but im not sure which one), but I then realise im not up for the job, as in not smart enough. Because of this im starting to lose focus in revision because i start to question alot. Please help.