Dating App

or,

A Dating App

People seem uncertain about what they are looking for, and I feel the same way, too.

However, it is hardIt is hard, however, to have chemistry with someone I have never met in person.

Interestingly, people often use '"something casual'" to describe their goals.

What the heck does that mean?! How is "something casual" a goal?

After breaking up with my ex-boyfriend, I feel like I have lost a part of myself, and because I am numb to emotions.

I think feeling numb or feeling as if we've lost a part of ourselves is a common result of a breakup. Remember, time heals all wounds so keep on living. You'll get there!

People seem uncertain about what they are looking for, and I feel the same way too.

'too' is redundant here (as you are using same)

During one conversation, a man told me a dad joke, and we talked about our favorite music and our views ofn the world.

However, it iwas hard to have chemistry with someone I have never met in person.

if you are continuing from the previous anecdote, you want to relate directly; if you're talking more generally, might make more sense to say 'hard to have chemistry with someone you have never met in person'

When I was younger, I had similar experiences, but it was more like a crush.

'it' and 'similar' are a little unclear here - what part of the situation? what was more like a crush?

Perhaps, I do not know how to love or what a healthy relationship is.

Comma is not needed here.

Interestingly, people often use 'something casual' to describe their goals.

No correction here, but this doesn’t make sense to me. I think you used the wrong word “goals” in this case. Something casual in the context of a dating app might be a relationship preference vs. a goal. Is that what you meant?