What matters most is your individual discipline. Groups are vehicles for the transmission of the doctrine and spiritual force. This can be extremely beneficial so long as the group maintains utmost purity in delivering and practicing the teachings. However, if it is your karma to be alone for some time, then so be it; accept your situation with gratitude, because it is part of your path. Karma is administered by your Being, so as to help you become spiritually mature. Do not worry; you will, in time, become associated with other groups in the physical plane if you are serious. This is known as the law of attraction. However, be careful what you wish for.
I began these studies many years ago without a group, and the first real (and perhaps only) Gnostics I met were in the internal planes. They have helped me more than anyone in this world, providing many warnings about the dangers of spiritual groups. Samael Aun Weor wrote about this extensively in his book The Major Mysteries, specifically in Initiatic Preparation, so I suggest you read that and bear in mind that the term "spiritualist" applies to "Gnostics" as well.
So long as there is ego within people, there will be problems and ordeals. Do not think that by joining a group you will advance further: attendance and participation with a group does not indicate progress. Sadly, this is what many so called "Gnostics" think, that a big group and constant attendance means everything is fine. In fact, a large majority of students will often remain stagnant and achieve nothing, simply because many groups teach dependence rather than the independent, self-cognizant and revolutionary will of the Being.
If you're alone, that is wonderful, because you have an opportunity to truly develop yourself without interference. Remember that the most adverse circumstances strengthen the soul the most, like a sapling that is displaced and planted in hard ground, forcing its roots to dig deep into the earth, thereby establishing a powerful tree unlike the weak that have no foundation. This is obviously what your Being wants, because this is where you are at; therefore, take courage, and be humbled, since this "solitude" will provide you tremendous force of will, if you know how to take advantage of it. I speak from experience.
Groups can help, but they will only be effective if you know how to practice on your own. Otherwise there is no force. Do not feel dismayed, because you are never alone. Your Divine Mother Kundalini and your Innermost are always with you, even if you do not see them. Christ wants to make His child into a warrior; therefore, be firm, practice to the best of your ability, and pray every day that He give you the willpower to transform yourself into what He wants: a Tree of Life, strong and majestic, that gives life and shade to those who suffer from delusion, one whose roots can never waver or be pulled, since they are established within the pure and stable earth of comprehension.
If you need strength, study the referenced excerpt below from Friedich Nietzsche's Thus Spoke Zarathustra, written for those who suffer much like you, and who in the remembrance of the Being rise to the occasion to reap the fruits of knowledge and conquer suffering.