First, welcome to PC.
When I was diagnosed I was only 20, and going through a lot. I went on a downward spiral for a while after, but in general the diagnosis has really helped me to change some things and has given me much insite.
Like you, I researched it and it fit me to a tee. I didn't need a doctor to tell me, but being told was validating.
Do you have insurance? I don't think you're over reaching by striving for more help. I am the same way. DBT is the best way to go. If you can't access a program right now, DBT Self Help is good.