Self promotion is one of those things that seems to have a gray area and truthfully I believe doing what works best for you is sometimes the best answer. If you do not try and self promote you cannot be upset with anyone but yourself. Social marketing and social media play a huge part in the success of many celebrities right now and continuing to promote yourself via social media could help guide you in the right direction, to achieve your own success.
In order to connect your accounts, you will need to go to YouTube Settings. From this page you will select the connected accounts tab on the left. Here you will be able to connect both your Facebook and Twitter. You have a few options of what you can automatically share. I prefer just choosing Likes and Uploads.
Good luck and maybe connecting your account and getting those posts/tweets out there can help you get a few more viewers and who knows maybe help you become that YouTuber you dreamed of becoming.