Dear Europeans and urban dwellers: being carless in some parts of the US (including, I imagine, many parts of Texas) is very different from being carless someplace with good public transit.
OP: you didn't give a lot of the distances between your other activities so it's hard to say how feasible your plan/lifestyle is. You also didn't say if you and your bf live together; regardless, you can probably do all sorts of errands together. My bf and I moved from Illinois to the LA area a year ago, and bought a car so we could take trips around the state, and not spend hours getting groceries. It worked out for us that we do most of our errands, social events, and trips together. But he uses it to drive to work and I borrow it on rare occasions when I have an awkward errand, like a doctor's appointment mid-day or an appointment at a government office like DMV. Since our use/benefit is pretty equal, I chip in 50% for gas and insurance, and then feel free to ask for it when I needed. Maybe you can work out something similar.
Other tips from years as carless or mostly-carless:
-Do check out the public transportation options. Texas isn't famous for it but the one bus your town has may just run on a convenient route for you. I was surprised how good the PT was in our LA suburb, given my (very low) expectations. Even if you don't use it regularly, you'll have a backup plan (besides walking) in case of a flat, etc.
-With a 1.5 mile commute I wouldn't be surprised if biking was faster than driving, accounting for parking.
-I used to avoid asking for rides typically, but I made an exception when I knew for sure it was on a friend's way, or like 2 mins away (I lived ~.5 mi from a lot of restaurants/bars, but it was a creepy walk at night, alone, as a woman). I did also accept if someone voluntarily offered and it significantly improved my transportation prospects (so not if my bus was coming in 3 minutes). If someone gave me particularly long or frequent rides, I'd give them some gas money or buy a drink. If you bum rides, be a good bummer ;)
- It's going to take more scheduling/planning to get places.
-There are still places and events you might opt out of or leave early because of transportation convenience. It will probably feel like "you know, it's just too much hassle to go to X". And that's ok.
Good luck, but you'll do fine!