Most people in Iran don't want war with the US or Israel. People are fed up with the ridiculously bad economic conditions and the negative sentiment surrounding the government from that human rights movement that led to mass imprisonment and executions hasn't gone anywhere. There's a huge portion of the country that views their government as the enemy (cos they are) and the rumblings of war as nothing more than something to distract people to keep the government firmly grasping to power. People haven't forgotten that the shadow of the war with Iraq led to the IR consolidating its power and purging out dissenting and more moderate voices post-revolution, they know how the IR operates when it is at war.
When you've got football crowds chanting "marg bar diktator", "marg bar Khamenei," and "marg bar jomhooriye islami" (death to the dictatorship/Khamenei/the Islamic Republic) every week, it really does give a finger on the pulse of how ordinary people in Iran feel about their government.
There's obvious division in the country though. In the more rural communities, support for the IR is strong. Amongst the elite of Iran, unsurprisingly because the reason they are elite has to do with their close ties to the government (if not being actively involved in governance), support for the IR is strong. But in the cities among normal people, I suspect the feeling is more common to what you see in the streets of Tehran or in the football stadiums of the clubs of the big cities. The increasing sentiment that the IR is not a legitimate government and one that only has its "mandate" to lead by the brutality they inflict on their people. All you have to do is look at Iranian posters on twitter/instagram, look at the ones that are actually coming out of Iran... and take a look at what they have to say about their government and sepahis (members of the IRGC). You might have to run it through a translator, but you can see the Iranians that are using their VPNs to express their thoughts to the outside world absolutely hate their oppressors.
And you can't really blame Iranians for not having any appetite for a war with Israel. First, there's a huge number of people that have bitter resentment towards Palestine. Iran's economy is in dire straights and the government funnels money to Hamas and Hezbollah in the name of ending oppression of Palestinians. A lot of Iranians think that money would be better spent on Iran. Inflation is out of control in Iran - tens of millions are struggling with the cost of living, wondering if they will be able to afford their homes & buy food at the same time.
This escalation, which now is likely to bring further US sanctions as well as a military response from Israel, is the last thing Iranians needed in this difficult time for them. The US sanctions have been largely ineffective because while they tank Iran's economy... it really only negatively impacts normal people. The elite keep their money flowing by using Russian and Chinese networks to skirt sanctions as well as simply selling oil on the black market. So further economic hell for the people living in Iran, along with the ever present threat of Israeli strikes.
It's why I find the calls from non-Iranians bellowing for Iran to throw itself into full blown war with Israel so offensive, tbh. These are already struggling and suffering people, to call for them to put their lives on the line to end the "oppression" of people other than themselves, while the international community largely sat back and didn't give a fuck about Iranians pleading for the international community to end their own oppression... it's just insane.
Iran has it's own problems and it's own oppressors to worry about before going to war with anybody else. And like Israel, is surrounded by countries that are either openly hostile or full of people that think less of them because of their religious beliefs and ethnicities - so the prospect of a greater regional war is the prospect of Iran going headfirst into an existential battlefield. Anyone with any interest in peace and stability in the region should be against this conflict escalating to Israel and Iran's cold war truly heating up.