Here is some advice:
Read Rich Dad Poor Dad
As @David Faulkner and Rich Dad Poor Dad indicate knowledge is important. What you get paid to learn what can make you successful is less valuable than the knowledge gained. Especially if RE turns into a passion. What is the best job? It is the job you enjoy the most not necessarily the one that pays the most. What is the second best job? The one that prepares you for the best job.
Research House hacking. I suspect if you ask the top 100 most successful BP users their recommendation for a young investor that House Hacking would be the #1 response.
Avoid Out of State (OOS) REI. It is not so much that you cannot be successful with OOS REI (but I think it is harder than the proponents admit) but that it does not provide the learning opportunities of self managed local investing. It relates to the value of knowledge and the best/quickest way to get this knowledge. Also my family's attempts at OOS have not been nearly as successful as our San Diego investments (the family is down to a single OOS unit and the only reason it has not been sold is the same tenant has been in the unit for at least 8 years).
Because you are an introvert consider Toast Masters or other ways to improve in that area. Rich Dad Poor Dad indicates that selling is a key skill in huge success. Note when you purchase RE you are selling your offer. When you sell in RE you are selling your RE. Dealing with people and being able to sell are very important for high level success (I do not consider myself High level successful but I do believe this and do believe it is an area that I could improve at).
Network. In San Diego there are numerous RE Meetup groups. I have not attended most of them. There is one that is put on about monthly by some San Diego BP users (@Justin R., @Kevin Fox, etc.) that I do enjoy as it is typically at a work in progress site. I like the network opportunity as well as the learning opportunity. Networking is another area that I believe I could improve at.
Realize that REI takes work and has risk. I went on vacation recently and my partner was having to deal with the units. An AC broke, a tenant argument occurred that resulted in 2 calls to the police and us letting a tenant terminate their lease early due to Homophobic neighbors, a mainline plumbing backup that resulted in having to replace some of the carpet in the unit, and a water heater giving out. I was gone only 2.5 weeks.
Note none of my advice benefits me in any way unlike some of the people pushing OOS investing that are in fact turnkey sales people. My advice is all stuff that I believe could benefit the OP. I suspect all except for possibly the avoid OOS is not controversial (there are OOS advocates, some who have been very successful, but I do not believe it is the place to start).
Good luck