Could you take Math or Physics at HL? Because 4 HLs, especially Math and Physics, really give you an edge on your applications to unis. If I were you, and if I wanted to secure every possible opportunity in case I change my mind or whatever, (ideally) I'd go with these:
HL Chemistry, Physics, Math, Psychology
SL English A Lit, Language (A or B)
That way you could make sure your application is strong since you'd clearly challenge yourself by this subject choice.
Chemistry HL is not THAT difficult as long as you 1) study throughout the 2 years and not just before the exams and 2) do past papers and get used to the questions. It also helps if you have a good background knowledge, but I assume you do since you'd choose it at HL.
Physics HL is a tough class, and you will struggle, but if you're persistent, no doubt you can get an excellent grade. Physics SL, on the other hand, is kinda difficult for Science SL (in fact, it is the toughest Group 4 SL there is), but you still learn a lot.
Math HL, as I hear from my colleagues, is very tough but also very rewarding. I was told that HL Math students spend 50% of their time doing maths, and other 50% doing other subjects.
Math SL is manageable even if your math abilities are not that good.
Math studies SL is a joke; don't take it because unis often look down upon it (if you're getting into a natural science course, that is).
Psychology HL... I used to love this class, but I soon figured out that they only test your ability to memorize a ton of information, and on the IB exams you have to write essay-style questions which you either 1. make up on the spot or 2. learn off by heart. Doing it at SL, IMHO, makes no sense, since the class is too demanding for an SL subject.
English A Lit isn't too bad, just make sure you read your texts regularly, when your teacher assigns it, and you'll be golden. Make sure to be active in class because you want 100% of what your teachers can offer you. If you're not a native speaker, maybe consider doing English B HL, just to get a bit of workload off your back.
Starting with the most difficult subject first:
Physics HL > Math HL > Chemistry HL > Psychology HL > English A SL > Language A or B SL
There's a wide range of careers you could pursue with the subject choice you outlined, so don't worry about it! You will start to "grow" towards a certain subject once you enter the DP anyway.