I think 'Jag är kär i dig' would be better for that (= is basically saying you have a crush on her). You could also use 'Jag tycker om dig' or 'Jag gillar dig', which means 'I like you'. If you want to go all out, feel free to use 'Jag älskar dig', which means 'I love you'.
- 'no' is inget/ingen/inga (negating nouns: 'no feelings' inga känslor)
- 'not' is inte (negating verbs: 'does not have' har inte).
It's possible to say Hon har inte känslor för dig in Swedish, but then the English sentence would have needed to be 'She does not have feelings for you'.