It seems that the personality matters a lot in who I find sexy in real life.
It does, and this is true for most people I believe independent of their sexuality. However, it's important to note that personality is more about compatibility in relationships than it is simply about sex. There are different levels of compatibly. Just because you are friends with someone, doesn't mean that the sex will be good. Also, just because the sex is good, doesn't mean you can be friends them. The ideal long term intimate relationship (which you never mentioned) has both personality and sexual compatibility.
You are currently figuring out who you are and what you like. You don't have to muddy the waters just yet by finding the PERFECT relationship.
Experience will help you tremendously figure out what you like, but it's not as easy as just randomly having sex and then you know for sure. Many first time sex experiences are far from good, again completely independent of the persons sexuality. Imagine if all the awkward first time sex experiences with heterosexual couples convinced them that they are gay. That doesn't happen for a good reason. Sex isn't always good, especially when you don't know what you like it's most likely going to be bad.
If you are going to take the advice of trying gay sex to see if you like it and since you are not currently looking for a relationship, I recommend being superficially picky about the man you choose. A friend might sound like a good idea, because you like their personality, but again you aren't looking for a relationship in this thread you are looking to find out what you like sexually. Find a man that excites you sexually and try to have sex with him. Of course, take all necessary precautions with safe sex and protect yourself.
Many people figure out their sexuality prior to having sex. Not everyone has it so easy, especially in a socially oppressive society.
You are bi-curious. It's possible you are bisexual.