There may be something in that. Research (even research done by people sympathetic to the gay cause) suggests that teenagers with same-sex attractions are more likely to be drawn to solitary activities. The chicken and egg phenomenon of course exists – does the “difference” involved in being gay cause a person to be alienated from “straight” peers, such that they naturally turn to solitary pursuits in order to amuse themselves, or does the interest in solitary pursuits lead to social exclusion and from there to this EBE sexuality and hence homosexual attraction. Frankly, I think that it's one of those inextricably linked phenomena, where you have two factors that feed into and play off of one another, and where neither of those two factors are wholly or exclusively responsible for the result that you get.
In any case, irregardless of which side of the pro hoc propter hoc divide you find yourself on, the fact is that a lot of people with same-sex attractions are lonely – gay because they're lonely, or lonely because they're gay, it really doesn't matter. The loneliness itself is worth discussing, because regardless of which is the cause, and which is the effect, there is no question that sexual temptations of any kind are amplified by loneliness.
The difficulty is that no matter how you slice it, most people in the LGBTQ crowd really and actually are different. Not everyone, but most. It's something that I still deal with in my own life, because frankly all of the personality traits and weird gender-attributes that made me think I was lesbian in the first place are still here, and they're not going away. It means that it's difficult, in many cases, for LGBTQ people to form friendships with straight folks – and especially with straight people of their own gender. I've met a lot of lesbians who think that straight girls are just weird. For gay guys, it's often even harder because the general opinion of most men, if you get them outside of a context where they feel that they have to be politically correct, is that gay men are effeminate and fruity. This leads to emotional distrust which is difficult to overcome.
Reparative therapy tends to try to deal with this by getting people to adopt behaviours and interests that are more typical of their gender, in order that they'll be able to become more acceptable and better able to make friends. I'm not sure how I feel about that. On the one hand, there are things that are kind of like that that I do myself. On the other hand, I think it's really important to do that in a way that is “natural,” in the sense of being compatible with my own personality. What this means, in terms of Catholic outreach, is that it's really, really important for Catholics to understand that the “faggy” or “butch” behaviours of LGBTQ people aren't necessarily affectations, and they're not necessarily some sort of psychological disorder that needs to be overcome. They're differences, but it is the responsibility of those who would become Christ to the world to accept and love those who the rest of the world is inclined to reject.