Question

1.I´d like to have more self-control in stressful situations I wish I could have more self-control in stressful situations ( is correct?)

Answer 1

“I’d like to have more self-control in stressful situations” está corretíssima.

Na segunda frase... quando usamos o “wish” o verbo logo depois deve estar no passado:

“I wish I had more self-control in stressful situations”