I got HSV 2 from my very first sexual partner. I've had a really tough time with it and still have frequent outbreaks 10 years later, but I just wanted to reassure you that most people don't have it quite as bad as I do and even if you do have problems with outbreaks, there is medication you can take that can stop you having them, and it also reduced the risk of you passing it on to a partner (I can't take it as I have had severe reactions with it but these are very, very uncommon and most people tolerate it with absolutely no problems).
There is also a very high chance that even though you have a blister on your genitals, it may be HSV1 rather than HSV2 as around 50% of genital herpes is now caused by HSV1. The fact that you only have one blister may actually be more suggestive of HSV1 as it tends to be a lot milder (I probably had over 100) If you have HSV1, that makes life a lot easier as it is the same virus that causes cold sores around the lips and lots of people will have it already so you won't be able to pass it on to them again. With HSV1, there is also no asymptomatic shedding in between episodes so you are basically fine to have sex in between having outbreaks (which tend to be very rare with HSV1 anyway) without risk of passing it on.
So basically, what I'm trying to say is that there is a high chance it may not be as bad as you are anticipating (though I totally appreciate how distraught you must feel about this). But even if it is HSV2 that you have, people still have relationships despite having it and as the anon above has said, it will just help to weed out people who were probably not worthy of being in a relationship with in the first place.
I'm sorry you are going through this and that you feel you can't speak to your mum, and I hope your friends are being supportive. I'm happy to answer questions if you have any.