Let me start with an anecdote.
I know someone who is morbidly obese. I don't know what her SMV would actually be to men, but they certainly don't give her the time of day. She doesn't register on their radar, and I would guess her SMV is a 3 according to this diagram. But regardless of where she is in the 1-3 range, she is solidly in the "nope" zone for most men.
Yet, she is happily married in the happiest marriage I have ever seen. She has a husband who is is a good provider while she is (mostly) a SAHM. He is charming, great around the house, a good father and a good leader. He is the type of man you can count on and trust. She loves and respects him, and together they make a pretty good team. It is a naturally red-pill, but neither of them are red-pill-aware.
She was able to get this man, despite being the same size the day she got married. But here's the catch, he is obese too.
When I watch them, both of them are fully invested in their relationship. While I don't find either of them physically attractive, they do. Neither of them feel dissatisfied or short changed in their relationship.
I tell this story, not to tell you about what is probable, because it may not be, but to tell you about what is possible. I've watched this relationship for a while, wondering if it defied the rules of The Red Pill. But it really doesn't, because while they are about evenly equated in SMV, they are also about equally equated in RMV. They are both realistic people who are not only satisfied with their life partner, they are thrilled. She looks at him and see someone she respects and admires, and he looks at her and see someone he cares about.
In The Red Pill, it is important that we do not ignore reality. In reality some people are low SMV, beyond their control. If what is making you less attractive is within your control, you should not take this as permission to not do something about it. But, if you are in the unfortunate set of people who have deformities that are unfixable, do the best with what you have but also be realistic with what you can get. Learn to look beyond someone's look for their value, and remember to have value beyond your looks. Your RMV is under your control, and if you are able to get that high, you will be able to get a relationship with someone with a high RMV. You may not be able to get a relationship with a hot doctor, but you could still be able to get the acne-scarred science teacher. As long as you are able to be positive and see his value, beyond his looks, there are many low SMV men who have great things to offer.
TD;DR Don't give up because you're ugly.