If it's Solo, yes. If I had a finished piano concerto, I would probably perform that as well.
Piano, because that's the only instrument I'm good enough at to perform on.
Of course.
Does improvising musical ideas for my compositions count? If so, yes.
Yes, that's a big part of my compositional process right there is improvising musical ideas. And, even if the initial improvisation isn't that good, I can still find motifs to develop into a theme that is good.
I use Musescore's default soundfont in combination with my piano improvisations. I'm somewhat satisfied. Not fully of course, like col legno(or the lack of it, I should say) is one thing I'm unsatisfied with because sometimes, I come up with a musical idea that works best with col legno. The closest I can get in Musescore is accented pizz, which is not at all the same sound. They are both more percussive than staccato, yes, but other than that, they are totally different.
No, especially not for instruments that aren't Piano, Harp, Harpsichord, or any sort of pitched percussion(If I use percussion, I tend to use pitched rather than unpitched, that's why I said that). Woodwinds get like maybe the closest of the other instruments to true performance, but only because I wouldn't expect any sort of notation software or even a DAW to get the true sound of something like multiphonics or some other rarely used advanced woodwind technique across. Brass, a bit further away. Strings the furthest from true performance because of lack of string distinction(i.e. there is no Sul G, Sul C, etc.) and several string techniques that are notated all the time(sul tasto, sul ponticello, col legno just to name a few). I only have a few like Staccato(of which I only have a staccato setting for it, I don't have Spiccato or any of the several other bowing techniques that are also notated with staccato dots), pizzicato, harmonics, and of course accent marks, but that's getting more into dynamics.
Which brings me to another point, the dynamics don't follow the true dynamic curves. In other words, a flute note marked fortissimo and the same note with the same marking at the same tempo on a violin staff will sound identical in intensity, when in reality, they don't sound anywhere close to identical. The violin is intrinsically more intense than the flute and dynamics in a good quality notation software in my opinion should reflect that. And even for just the flute itself, if it's lower than C5, forte is relative and not absolute, because it can't reach an absolute forte in the low register. An absolute mezzo-forte is as loud as it gets, so forte would imply "Play the piano dynamic before it quieter than you otherwise would" for low register flute, I think.
I've thought about it, but I don't even know where I'd start if I wanted to contact the musicians. Like, if I wanted an orchestral performance, since the Columbus Symphony Orchestra is the closest orchestra to my house, would I go to the Columbus Symphony Orchestra website and contact them via email or what? And what about chamber groups like string quartets and woodwind ensembles? What about a single soloist for like a Flute Sonata or whatever?
I do have a group of friends who I told about my compositions including my orchestral compositions. Not musician friends, just regular friends. We have these monthly in-person reunions and weekly video chats, me and my friends. And at one of the in-person reunions, one of the facilitators, who is also a friend of mine, said something about getting an orchestra at one of these reunions so that they can play my orchestral pieces. That would be so amazing if it ever happens, but until then, I'm basically in the maze that is trying to find musicians to contact on the internet and figuring out whether to email them or call them or whatever. Haven't found my way through it yet, so I don't have any performances, yet.
And as for piano performance by me, well, it's been years since I last performed publicly as a pianist. I had this jealousy thing happen with my piano teacher because I was progressing faster than probably any of her other students, which, although in my first year, was a positive thing, made me learn my favorite Mozart pieces sooner, by the time my second year came around and I felt ready for Chopin, it turned negative on me and that was the last year that I performed publicly. Ever since then, I've only ever done private performance for like family and close friends(Well, that's not entirely true, I did perform once several years ago at a hospital, but even then, it was for my grandparents that I performed, any public listening that weren't family members was just a bonus). And I have no idea how to get back into it, because the place I used to perform as a pianist went out of business, and I don't know of any other place except my college that has piano performance. And I have no idea if I have to like be in a certain class or if anybody who plays music can perform regardless of what class they are in, because I have never thought about doing like a piano recital at my college. Plus, I get really nervous performing around people I don't know, like "What if I make a mistake? Everyone will hear me do it, not just myself or my parents. I know I can play it mistake free, I know I'm capable, but I know stress can lead to mistakes and this sort of situation is stressful".