What is it like to know two languages?

To all multilingual ones here, I pose this question: what is it like knowing multiple languages? Do you think in different languages, change when the environment does, or switch between them randomly? Do you ever get your words mixed up (i.e., you're talking to an English speaker but instead of saying cheese you say queso)? Do you find that knowing another language helps or hinders your understanding of your native one?

Pick and choose whatever you want to answer, but thank you for your time either way!

What is it like knowing multiple languages?

People might think of it as a waste (my family does and constantly bothers me about it), but it's nothing special to me. I grew up in Southern California to hispanic parents, it's no surprise that I spoke Spanish first. They COULD have taught me English first, which would've helped a shitload in kindergarten and first grade, as I kinda struggled with English pronunciation. So now, I avoid speaking it at all costs out of resentment and embarrassment at my horrible pronunciation (of Spanish). I also took four years of French in high school. Feels pretty cool to understand things that most people don't and to carry on conversations with some family members who speak it.

Do you think in different languages, change when the environment does, or switch between them randomly?

I only think in English. Occasionally, I mix things up and attempt thinking in French, just to see how well I can articulate myself. Doesn't last more than a minute.

Do you ever get your words mixed up (i.e., you're talking to an English speaker but instead of saying cheese you say queso)?

Often, when I cannot think of a word in French, I go to the Spanish equivalent and try making it sound French. Same when I don't understand a French word, I try figuring it out with similar-sounding words in Spanish.

Do you find that knowing another language helps or hinders your understanding of your native one?

Understanding French grammar has kind of helped with some stuff in English, not too much. Even if French and English could help my understanding of Spanish, it doesn't matter to me.