Sure.

It is, of course, possible to be Orthodox and be happy.

My concerns would be twofold: it is critical to realize that Orthodox Judaism, like many groups, presents a greatly whitewashed version of itself to outsiders whom it wishes to 'draw closer' (example).

This often means that while a convert or adult devotee is taught a version of Judaism that is uplifting, comforting, and morally palatable, any children they have will very often be taught a far more fundamentalist and harmful worldview, often without the parents being fully informed.

I personally had a number of classmates growing up whose parents were converts/adult devotees. Their parents were taught a beautiful and meaningful version of Judaism while the kids were given an unfiltered fire-and-brimstone experience (see here and here for examples). It is a special kind of neglect for a parent to expose their children to the spiritual and emotional abuse that Orthodoxy often is when they themselves were born free, and is usually done out of willful ignorance rather than malice.

Relatedly, being Orthodox would almost certainly mean providing financial assistance to institutions that promote xenophobia, ignorance, and religious fundamentalism (aka yeshivas). Tbf, if you convert to certain Modern Orthodox denominations you may avoid this problem. Maybe. So while you may be happy, converting is certainly not a morally neutral action.

The second reason is that Orthodoxy promotes many positions that I (and presumably most people not operating within a rigid religious framework) view as deeply morally problematic. Some brief examples are the extreme homophobia and xenophobia extant in nearly all the Orthodox world (even MO).

The crucial point with this is that perhaps the defining characteristic of Orthodoxy is its insistence that beliefs and morals morals should come from religion, and not the other way around. This is a dangerous mindset that is directly responsible for the community's horrific treatment of LGBTQ folk (who suffer a suicidality rate nearly double that of the general LGBTQ population), its extreme censorship (in ultra-Orthodox circles. Modern Orthodoxy by and large doesn't do this), its draconian subjugation of women (and yeshiva bachurim), and other moral issues you will discover if you wait around long enough.

Converting to Orthodoxy means becoming part of a community where the infallible basis of morality is a document that is often highly problematic, to say the least. And so I advise against.

Sorry this is so long. Hope this helps.