Even people who don't snore routinely can snore in certain unaccustomed sleeping positions. For example, I am a very quiet sleeper when I am in my usual position, which is on my side. But, if for some reason, I am on my back, I can occasionally snore.
As someone pointed out, I think it's important, both from the standpoint of your own health and from that of a possible bed partner, that you find out if you are just an occasional snorer, or you have apnea.
Apnea is a health issue. People with apnea are actually stopping to breath, briefly. They snort for air, and wake themselves up. This is not necessarily related to weight.
A very close friend of mine has it. He's a personal trainer and has pretty close to a perfect body. When we're together, I can't sleep with him. It's so bad that you can hear him from the second bedroom one room and a hallway distant. Ear plugs don't help. Hence, when we've been together, that part of intimacy involving sleeping together can't occur. I simply can't sleep.
I've told him that apnea is associated with enhanced risk for stroke. It's really an issue he needs to address, and not easily dismissed by just claiming it's snoring.
Anyway, I guess my first advice is to find out if you are really snoring, or have sleep apnea. If it's the latter, it's more than just an annoyance to you and other people. It's a possible health issue.