I was 27 when I had my first seizure, I'm 42 now, but I can sort of understand what you're going through.
Before my first seizure I was living on my own, could drive, and I had a ton of friends. The first seizure I had was so severe that I had to be put in a coma, to calm my brain down is how I describe it, about a month because they couldn't get the seizure to stop.
When I was finally able to leave the hospital I had to move back home, couldn't drive any more and I was still having seizures left and right. I don't know how many med changes I went through. Some because they didn't work or I couldn't handle the side effects.
I had a ton of friends before then and we'd get together all the time. But when I had to move back home they all lived about 45 minutes away and since I couldn't drive it was really hard to get together. They all just seemed to dwindle off. I don't know if they were scared of me or just didn't want to go through all the trouble it took to see me. I'd even been dating a man at the time and the same happened with him. He never officially 'broke up' with me, he just stopped calling.
I have one really good friend now. The funny thing about her is we hated each in high school but we both got jobs waitressing in the same restaurant and got to be friends. She lives about 45 minutes away, has a full time job, is married and has kids. She calls and texts a good bit and we always get together at least once a month.
Try not to isolate yourself! Get out of the house as much as you can, even if it's with your parents or another family member. Don't feel like a burden, family is usually the ones who want to help the most! My parents would try to get me out of the house as much as they could, even if it was just going to the grocery store, so I could be around people. If there's things going on in town that you'd like to go to see if someone will take you. I don't have much of a problem talking with people, I never did, I can pretty much walk up to someone and start a conversation so it was really nice to be able to do this.
I don't know if your scared about having a seizure in public but don't be. I know I was until I had my first one. After that it just seemed normal, if that's the right way to describe it. One of the best was when I was in the grocery store with my dad. I was pushing the buggy when I had the seizure then took off down the isle grabbing things off the shelves putting them in the buggy. My dad ran after me trying to stop me and pull everything out I was putting in it! We still laugh about this!
Hanging out with your parents might now sound like fun but it can be. I'm not sure how close you are with your parents but I'm pretty close with mine so it wasn't much of a problem. There was a concert that I wanted to go see so my mom took me. While we were waiting in line I heard someone say the name of a band that I really like. I started looking around and asked who said the name of the band. A man said he did and we started talking about them. I gave him my phone number and he called two days later and asked me out.
I was upfront with him right from the start about my epilepsy, things I can and can't do, what my seizures are like and everything else. We dated for about two weeks then I had my first seizure in front of him, and it was a bad one, and I ended up in the ER. It scared the crap out of him but about two years, and I don't know how many seizures later, we got married and he's still here.
I know I'm a good bit older than you but I act like I'm your age more than I do mine. If you need someone to talk to let me know.