I don't think it has anything to do with age being a thing on your end, being young in ways has advantages I would say. But I will say this, I can relate to how you feel really on the title/topic at hand.

My interest checks are ignored too, I think it is more of people not interested in me or my ideas. You're not rejected because of age at least to me from the standpoint of experience and youth. I know some people are not as comfortable roleplaying with someone who is not older like 18 plus, some maybe want to be safe in a sense of not wanting to be in trouble.

I do not think it is dumb to complain about a problem you have, I think if you have a problem and you need help then voice it out. I do know the feeling of struggling and dark times, the feeling of loneliness does in fact suck. Truthfully it does.