The pain being manageable which makes you reluctant to have more aggressive treatment, the reluctance to have Botox or LIS, and the being bummed about not being able to party with your friends (let's just say I personally partied pretty hard -- ok maybe TOO hard -- in college :)), I can understand all of that... The working out, well ok, I was never big on working out, so that part I don't get, but for the rest I think I can relate

And it's 100% understandable.
But here's the deal: you mentioned that you don't know for sure that you actually have a fissure. Has anyone ever actually seen it? Or is it just a presumptive diagnosis at this point?
Fissures can cause rectal pain and spasms, and blood with BMs (not sure if you have this as a symptom but I sure did), but they're not the only thing that can. I'd say the first thing to do is to make sure you're truly dealing with a fissure. I'd see at least two docs and have them both take a look to see if they can visualize the fissure as well as where it's located. If you can tolerate it, they can use an anuscope, but many colorectal docs won't need an anuscope to see a fissure. They can do it by gently spreading the buttocks apart to look, and they can detect sphincter spasms using a finger.
I mean, based on the symptoms you've talked about so far, I'd guess it's likely a fissure too, but I think it's important for someone to see it and be certain. Once you know for sure that's what it is, then you can decide what you want to do next. I personally tried nitroglycerin first, then nifedipine, then Botox, then diltiazem, and finally LIS.
I won't say anything one way or the other about LIS, because I'm still recovering from mine and have had a rather ummm "interesting" (not in the way that I'd like) experience with it so far, so the jury's still out for me when it comes to that. But I haven't heard of many horror stories with Botox. The main disappointment with Botox that I'm aware of is that it didn't work or wasn't permanent (in fact my own weird experience aside this is the main complaint that I'm aware of with LIS too). I had absolutely zero problems with Botox, I drove to the doctor's office 60 miles away, had it done, and drove right home (through rush hour traffic with a stick shift -- that's how easy the procedure was!). It allowed my fissure to heal for months before I re-tore it by being careless.
You'll get different opinions when it comes to Botox and LIS, but I don't think anyone will disagree that you should get a definitive diagnosis and then consider more aggressive treatment.